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Offshore Sand Bar

An offshore sandbar is a submerged or partly exposed ridge of sand or coarse sediment that is built by waves offshore from a beach. The swirling turbulence of waves breaking off a beach excavates a trough in the sandy bottom. Some of this sand is carried forward onto the beach and the rest is deposited on the offshore flank of the trough . Offshore bars are typically formed by the action of waves and currents on the coastline, and they can shift and change in size and shape over time .

Offshore bars are a common feature of the surf zone of sandy coasts subject to energetic wave action. Their occurrence is related to the shoreface slope, which should be smaller than about 1/30 . Sandbars are most pronounced in the heavy surf of the stormy season; they also migrate shoreward in gentle seas and seaward in high seas. Thus, although sandbars have greatest relief in the stormy season, they are more submerged . Bay-mouth bars may extend partially or entirely across the mouth of a bay; bay-head bars occur at the heads of bays, a short distance from shore . Barrier bars or beaches are exposed sandbars that may have formed during the period of high-water level of a storm or during the high-tide season. During a period of lower mean sea level, they become emergent and are built up by swash and wind-carried sand; this causes them to remain exposed. Barrier bars are separated from beaches by shallow lagoons and cut the beach off from the open sea. They occur offshore from coastal plains except where the coasts are rocky; where the tidal fluctuation is great (more than 2 1/2 metres [8 feet]); or where there is little wave activity or sand. Barrier bars are common along low coasts, as off the shores of the Gulf of Mexico, where they parallel straight beaches. They often are cut by tidal inlets and are connected by underwater tidal deltas; they convert irregular shorelines to nearly straight ones .

In conclusion, offshore sandbars are submerged or partly exposed ridges of sand or coarse sediment that are built by waves offshore from a beach. They are typically formed by the action of waves and currents on the coastline, and they can shift and change in size and shape over time. Offshore bars are a common feature of the surf zone of sandy coasts subject to energetic wave action. Their occurrence is related to the shoreface slope, which should be smaller than about 1/30. Sandbars are most pronounced in the heavy surf of the stormy season; they also migrate shoreward in gentle seas and seaward in high seas. Barrier bars or beaches are exposed sandbars that may have formed during the period of high-water level of a storm or during the high-tide season. They occur offshore from coastal plains except where the coasts are rocky.

Silicon Optical Waveguide

A silicon optical waveguide is a device that guides light along a path on a silicon chip. It is a key component of silicon photonics, which is the study and application of photonic systems that use silicon as an optical medium . Silicon waveguides can be readily fabricated from silicon-on-insulator (SOI) wafers using standard complementary metal-oxide-semiconductor (CMOS) processes . The basic structure of a silicon waveguide consists of a longitudinally extended high-index optical medium, called the core, which is transversely surrounded by low-index media, called the cladding . A guided optical wave propagates in the waveguide along its longitudinal direction.

There are two basic types of silicon waveguides: planar waveguides and nonplanar waveguides. In a planar waveguide, the core is sandwiched between cladding layers in only one direction, with an index profile n(x). The core of a planar waveguide is also called the film, while the upper and lower cladding layers are called the cover and the substrate . Planar waveguides are used for integrated photonics, such as laser chips . In a nonplanar waveguide, the index profile n(x, y) is a function of both transverse coordinates x and y. There are many different types of nonplanar waveguides that are differentiated by the distinctive features of their index profiles .
ilicon waveguides offer several advantages over other waveguide materials. They have a high refractive index, which allows for strong confinement of light in the waveguide . They are also compatible with CMOS processes, which makes them easy to integrate with other electronic components on a silicon chip . Silicon waveguides can be used for a wide range of applications, including optical interconnects, optical modulators, and optical sensors.

The design and optimization of silicon waveguides is an active area of research. Researchers are exploring new waveguide structures and materials to improve the performance of silicon waveguides. For example, slot waveguides are a type of silicon waveguide that have a low-index slot region between two high-index silicon layers. This structure allows for strong confinement of light in the slot region, which can be used for applications such as sensing and nonlinear optics . Silicon photonic wire waveguides are another type of silicon waveguide that have a submicron cross-section. These waveguides offer efficient media for nonlinear optical functions, such as wavelength conversion.

In conclusion, silicon optical waveguides are devices that guide light along a path on a silicon chip. They are a key component of silicon photonics, and can be readily fabricated from SOI wafers using standard CMOS processes. Silicon waveguides offer several advantages over other waveguide materials, including a high refractive index and compatibility with CMOS processes. They can be used for a wide range of applications, and researchers are exploring new waveguide structures and materials to improve their performance.

Real vs. Virtual Image in Physics explained

A real image is an image that is formed when light rays from an object converge at a point after reflecting from a mirror. A real image can be projected onto a screen or a wall, and it is inverted (upside down) compared to the object. A real image is formed by concave mirrors when the object is placed beyond the focal point of the mirror. A real image is also formed by convex lenses when the object is placed beyond the focal point of the lens.

A virtual image is an image that is formed when light rays from an object appear to diverge from a point behind the mirror. A virtual image cannot be projected onto a screen or a wall, and it is upright (right side up) compared to the object. A virtual image is formed by plane mirrors, convex mirrors, and concave mirrors when the object is placed between the focal point and the mirror. A virtual image is also formed by concave lenses and convex lenses when the object is placed within the focal point of the lens.

The difference between real and virtual images can be understood by using ray diagrams, which show the path of light rays from the object to the image. For example, the following ray diagram shows how a real image is formed by a concave mirror:

The following ray diagram shows how a virtual image is formed by a convex mirror:
The main characteristics of real and virtual images are summarized below.

Physical Features Landforms And Bodies Of Water

Physical features are the natural characteristics of the Earth’s surface, such as mountains, valleys, rivers, lakes, and oceans. They are shaped by various forces, such as plate tectonics, erosion, weathering, and climate. Physical features influence the distribution and diversity of life on Earth, as well as the human activities and cultures that develop in different regions.

Landforms are the specific shapes and forms of the Earth’s surface, such as hills, plateaus, canyons, and deltas. They are classified into three main types: mountains, plains, and plateaus. Mountains are high, steep, and rugged landforms that rise above the surrounding land. They are formed by the collision, folding, or volcanic activity of tectonic plates. Plains are flat or gently rolling landforms that cover large areas of land. They are formed by the deposition of sediments by rivers, glaciers, or wind. Plateaus are elevated landforms that have a flat or slightly sloping surface. They are formed by the uplift of large blocks of land or by the erosion of surrounding land.

Bodies of water are the areas of water that cover most of the Earth’s surface, such as oceans, seas, lakes, rivers, and streams. They are classified into two main types: saltwater and freshwater. Saltwater bodies of water are the oceans and seas that contain high concentrations of dissolved salts and minerals. They cover about 71% of the Earth’s surface and are connected by currents and tides. Freshwater bodies of water are the lakes, rivers, streams, and ponds that contain low concentrations of dissolved salts and minerals. They cover about 1% of the Earth’s surface and are mainly fed by precipitation and runoff.

Physical features, landforms, and bodies of water are interrelated and interdependent. They affect and are affected by each other in various ways. For example, mountains can influence the climate and precipitation of a region, as well as the flow and direction of rivers. Rivers can carve out valleys and canyons, as well as deposit sediments and nutrients in deltas and lakes. Lakes can provide habitats for aquatic life, as well as sources of water for irrigation and drinking. Oceans can moderate the temperature and humidity of the land, as well as transport heat and moisture across the globe.

Physical features, landforms, and bodies of water are also important for human society and civilization. They provide natural resources, such as water, minerals, soil, and energy. They offer opportunities for recreation, tourism, and exploration. They pose challenges and hazards, such as floods, droughts, landslides, and earthquakes. They shape the history, culture, and identity of different peoples and nations. They inspire the imagination, creativity, and curiosity of human beings.

In conclusion, physical features, landforms, and bodies of water are the essential components of the Earth’s surface. They are the result of complex and dynamic processes that occur within and on the Earth. They are the basis of the natural environment and the human environment. They are the source of beauty and wonder, as well as of problems and solutions. They are the subject of study and discovery, as well as of appreciation and preservation. They are the physical features of our planet.

Stem cells

See the below image for the Stem cells diagram. A stem cell is a cell with the unique ability to develop into specialised cell types in the body. In the future they may be used to replace cells and tissues that have been damaged or lost due to disease. Our body is made up of many different types of cell.

Stem cell, an undifferentiated cell that can divide to produce some offspring cells that continue as stem cells and some cells that are destined to differentiate (become specialized). Stem cells are an ongoing source of the differentiated cells that make up the tissues and organs of

Adult stem cells, also called somatic (from Greek ÏÏÎ¼Î±ÏÎ¹ÎºóÏ, “of the body”) stem cells, are stem cells which maintain and repair the tissue in which they are found. They can be found in children, as well as adults.

Animal cell illustration

See the below image for the Animal cell illustration diagram. The animal cell diagram is widely asked in Class 10 and 12 examinations and is beneficial to understand the structure and functions of an animal. A brief explanation of the different parts of an animal cell along with a well-labelled diagram is mentioned below for reference. The Cell Organelles are membrane-bound, present within the cells.

Animal Cell Definition. An animal cell is a type of eukaryotic cell that lacks a cell wall and has a true, membrane-bound nucleus along with other cellular organelles.

Animal Cell is a fundamental topic taught in class 9 and higher. To find more information about the animal cell structure, its types, functions cell diagram or other related topics, please explore BYJU’S Biology. What is an animal cell?

Cell biology cell structure

See the below image for the Cell biology cell structure diagram. Each cell contains a fluid called the cytoplasm, which is enclosed by a membrane. Also present in the cytoplasm are several biomolecules like proteins, nucleic acids and lipids. Moreover, cellular structures called cell organelles are suspended in the cytoplasm. What is a Cell? A cell is the structural and fundamental unit of life.

A cell is the structural and fundamental unit of life. The study of cells from its basic structure to the functions of every cell organelle is called Cell Biology. Robert Hooke was the first Biologist who discovered cells. All organisms are made up of cells.

The nature and function of cells. One major organelle, the nucleus, contains the genetic information necessary for cell growth and reproduction. Each cell contains only one nucleus, whereas other types of organelles are present in multiple copies in the cellular contents, or cytoplasm. Organelles include mitochondria,…

Cell structure and function

See the below image for the Cell structure and function diagram. By: Daniel Nelson | November 20, 2017. The cell structure is defined by the cell membrane, the cytoplasm, and the nucleus. A cell is the smallest unit of life and its structure helps it to work as the basic building block of biology. The cell function is to keep all of the functions of the body performing as intended.

Some functions performed by cells are so vital to the existence of life that all cells perform them (e.g. cellular respiration). Others are highly specialised (e.g. photosynthesis). Figure 2.9 shows a two-dimensional drawing of an animal cell. The diagram shows the structures visible within a cell at high magnification.

The roles of the organelles within the cells need to be introduced and relate structure and location of organelles to their function. Cells differ in size, shape and structure and therefore carry out specialised functions. Link this to tissues.

Parts of animal cell

See the below image for the Parts of animal cell diagram. The Parts Of An Animal Cell. There are 13 main parts of an animal cell: cell membrane, nucleus, nucleolus, nuclear membrane, cytoplasm, endoplasmic reticulum, Golgi apparatus, ribosomes, mitochondria, centrioles, cytoskeleton, vacuoles, and vesicles.

Animal Cell Structure 1 Nucleus. The nucleus contains all the genetic material in a cell. … 2 Ribosomes. Ribosomes are organelles found in both prokaryotic and eukaryotic cells. … 3 Endoplasmic Reticulum. … 4 Golgi Apparatus. … 5 Lysosomes. … 6 Mitochondria. … 7 Cytoplasm. … 8 Cytoskeleton. … 9 Cell Membrane. …

All animal cells are made up of various different parts. These parts are called subcellular structures. The parts of a cell that have a specific function are called organelles. Let’s look at each of these in more detail. All animal cells have a plasma membrane. This is a barrier that surrounds the cell and holds it together.

Newtons laws of motion diagram

See the below image for the Newtons laws of motion diagram. Newton’s First Law of Motion states that an object in motion tends to stay in motion unless an external force acts upon it. Similarly, if the object is at rest, it will remain at rest unless an unbalanced force acts upon it.

Newton’s laws of motion imply the relationship between an object’s motion and the forces acting on it. In the first law, we understand that an object will not change its motion unless a force acts on it. The second law states that the force on an object is equal to its mass times its acceleration.

Newton’s laws of motion are three laws of classical mechanics that describe the relationship between the motion of an object and the forces acting on it. These laws can be paraphrased as follows: Law 1. A body continues in its state of rest, or in uniform motion in a straight line, unless acted upon by a force.