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The amount of heat required for 1 kilogram of substance to increase the temperature by 1 kelvin is called as specific heat capacity.

The size of the pupil of the eye automatically adjusts itself according to the intensity of light passing through it;if the intensity is more , the size is less, if less, it is more. So in our case the pupil should dilate i.e, increase in size to be able to see in the dark . This switchover takes some time. But here the entry into the dark room is immediate . So the eye has no time to adjust itself and hence is not able to see at all for a while.

The energy of the light is related to the frequency; when the light enters the medium there are interference patterns that cause the apparent speed of light to change; if the frequency changed, the energy would not be conserved. The wavelength changes to balance the change in speed.

As light moves from air into water, it not only slows but the wavelength changes.

If water freeze in surface still water remains liquid at depth. The maximum density of water is at 4 degree. and at the point of temperature of water occupy the bottom portion of water body while heat is absorbed at surface and consequently freeze to ice. This is also give a protection to absorb heat from bottom and bottom water remains liquid even is at zero degree

Acceleration is the rate of change of speed. So constant speed means no accelaration.

The cyclist does so, the ground exerts the opposing frictional force which is directed in the direction he wants to make turn. So when a cyclist move in curved path a outward force act on him and to balance that force cyclist lean inwards to create force in opposite direction.

The astronomical unit is a unit of length, roughly the distance from Earth to the Sun. However, that distance varies as Earth orbits the Sun, from a maximum (aphelion) to a minimum (perihelion) and back again once a year. Originally conceived as the average of Earth’s aphelion and perihelion, since 2012 it has been defined as exactly 149597870700 metres, or about 150 million kilometres (93 million miles). The astronomical unit is used primarily for measuring distances within the Solar System or around other stars. It is also a fundamental component in the definition of another unit of astronomical length, the parsec.

A hydrogen atom has one proton and one electron. But hydrogen is also the least energetic element. Even the most energetic line hydrogen emits (when an electron drops down from the second shell to the first) has only enough energy to be an ultraviolet photon. So hydrogen atoms do not emit X rays.

The SI system, also called the metric system, is used around the world. There are seven basic units in the SI system: the meter (m), the kilogram (kg), the second (s), the kelvin (K), the ampere (A), the mole (mol), and the candela (cd).

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