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Meghna Thapar 5 years, 9 months ago
Gas particles have broken away from the intermolecular forces that hold liquids and solids together. An alternative name for intermolecular forces is the van der Waals forces. They include London Dispersion Forces, dipole-dipole forces, and hydrogen bonds. In liquids, the intermolecular forces are strong enough to keep the particles tied upon to each other but not strong enough to keep them in fixed positions. ... In gases, the intermolecular forces are negligible (extremely weak), and the constituent particles are free to move.
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Meghna Thapar 5 years, 9 months ago
The angles of incidence and reflection are measured with respect to the normal to the surface. When a ray of light is reflected, the reflected ray lies in the same plane as the incident ray and the normal and the incident ray, reflected ray, and the normal, all lie in the same plane. A plane mirror is a mirror with a flat (planar) reflective surface. For light rays striking a plane mirror, the angle of reflection equals the angle of incidence. The angle of the incidence is the angle between the incident ray and the surface normal (an imaginary line perpendicular to the surface).
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Meghna Thapar 5 years, 9 months ago
When a ray of light passes from a denser material (eg water or glass) into a less dense material (eg air) it is bent towards the surface between the two materials. This means that in this situation the angle of refraction is always greater than the angle of incidence. The bending occurs because light travels more slowly in a denser medium. ... Figure (b): Shine the light into the glass at an angle. As the light enters the water, it is refracted. Since the light is passing from air (less dense) into water (more dense), it is bent towards the normal.
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Smog is the most common type of atmospheric pollutant which affects a major portion of the world. The combination of two words namely, smoke and fog results in the formation of the word ‘smog’ Smog falls under particulate pollutants, as it is composed of very minute particles .
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Yogita Ingle 7 years, 2 months ago
Friction is a force that is created by two surfaces that come into contact. Depending upon the two surfaces that are doing the contacting, a little or a lot of destructive power may be created. This depends on the roughness or smoothness of the surfaces. Each surface, microscopically speaking, has lots of tiny grooves or cracks in it. When the two surfaces contact, the grooves and cracks interlock with each other, making movement between the two surfaces difficult. Heat is a common product generated by the two surfaces, as they contact each other. A good example of friction is rubbing your two hands together. In a short amount of time, enough friction will be created to heat your hands up. Different amounts of friction may also be demonstrated by using different surfaces, such as pushing a loaded box across carpet (rough) and a tile floor (smooth).
Posted by Ashish Kumar Karn 7 years, 2 months ago
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Meghna Thapar 5 years, 9 months ago
Tropical cyclones are like giant engines that use warm, moist air as fuel. That is why they form only over warm ocean waters near the equator. The warm, moist air over the ocean rises upward from near the surface. Factors like wind speed, wind direction, temperature, and humidity contribute to the development of a cyclone. The center of the cyclone is a cloudless calm area this is called the eye. In this area, winds are not very strong and there is no rainfall.
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Arjun Kunwar 7 years, 2 months ago
1Thank You