Physics Quiz 3

Frequency determines colour, but wavelength is the easier thing to measure. These wavelengths range from 700 nm at the red end of the spectrum to 400 nm at the violet end. Visible light waves are the only electromagnetic waves we can see.

When sunlight incident on raindrops formation of a Rainbow occurs in the sky. These raindrops work as a prism. When sunlight hits a raindrop, some of the light is reflected. The electromagnetic spectrum is made of light with many different wavelengths, and each is reflected at a different angle. Thus, spectrum is separated, producing a rainbow.

The period of oscillation of a simple pendulum is T=2π√(l/g). The value of g is less on the moon than that on the surface of the earth. So T increases. Hence, the time period of a pendulum when taken to the Moon would increase.

Cloudy nights are warmer compared to clear nights because of radiation. On Cloudy nights, clouds warm the Earth by absorbing infrared radiation emitted from the surface and reradiating it back down.

A spherical ball made of steel when dropped in a mercury container will be on the surface of mercury because the density of mercury is higher than that of steel.

A geostationary satellite is an earth-orbiting satellite, placed at an altitude of approximately 35,800 km directly over the equator, that revolves in the same direction the earth rotates (west to east). At this altitude, one orbit takes 24 hours, the same length of time as the earth requires to rotate once on its axis. So they seem stationary, relative to the Earth's surface.

The atmosphere is heated mainly by the Radiation from the Sun. This radiation when passes through the atmosphere is absorbed by soil, plants, water bodies, the air molecules.

A cylindrical lens can be used to treat astigmatism. Astigmatism is a condition that results in the abnormal curvature of your cornea or the lens of your eye.

Smog is a kind of air pollution. The smoke usually came from large amounts of coal burning in an area and is caused by a mixture of smoke and sulphur dioxide (SO₂).

Remote-sensing device (RSD) has an inbuilt source of infrared Ray. Remote sensing is a type of geospatial technology that samples emitted and reflected electromagnetic (EM) radiation from the Earth's terrestrial, atmospheric, and aquatic ecosystems in order to detect and monitor the physical characteristics of an area without making physical contact.