Physics - Study Mode
[#351] What is colour of light related to ?
Correct Answer
(A) Amplitude
Explanation
Solution: Colour or colour is the visual perceptual property corresponding in humans to the categories called red, green, blue, and others. Colour derives from the spectrum of light (distribution of light power versus wavelength) interacting in the eye with the spectral sensitivities of the light receptors. Colour categories and physical specifications of colour are also associated with objects, materials, light sources, etc., based on their physical properties such as light absorption, reflection, or emission spectra. By defining a colour space, colours can be identified numerically by their coordinates.
[#352] The redness in atmosphere at Sunrise and Sunset is due to :
Correct Answer
(D) Scattering of light
Explanation
Solution: The red colour in the sky at sunset (and sunrise) is due to an effect called Rayleigh scattering. At sunrise or sunset, since the Sun is low on the horizon, the light rays must pass through more of the atmosphere – and therefore bounce off more molecules – than at other times of day. Thus, blue light gets scattered away before the light reaches your eyes. Other colors – such as red, orange and yellow –continue to pass through the atmosphere unaffected.
[#353] The sky appears blue due to
Correct Answer
(A) Rayleigh scattering
Explanation
Solution: The sky appears blue due to Rayleigh scattering.
[#354] What is a compound microscope?
Correct Answer
(B) A microscope that has two sets of lenses : an occular lens and an eyepiece.
Explanation
Solution: A microscope that has two sets of lenses : an occular lens and an eyepiece.
[#355] Which one of the following is used for sun glasses ?
Correct Answer
(C) Crooks glass
Explanation
Solution: A type of glass that contains cerium and other rare earths and has a high absorption of ultraviolet radiation is used in sunglasses. Sunglasses or sun glasses are a form of protective eyewear designed primarily to prevent bright sunlight and high-energy visible light from damaging or discomforting the eyes. They can sometimes also function as a visual aid, as variously termed spectacles or glasses exist, featuring lenses that are coloured, polarized or darkened. In the early 20th century they were also known as sun cheaters. The colour of the lens can vary depending on style, fashion, and purpose, but for general use, red, grey, green, or brown are recommended to avoid or minimize colour distortion, which could affect safety when, for instance, driving a car or a school bus.