(a) We feel the warmth of the sun light but not the pressure on our hands. Explain.
(b) Which out of wavelength, frequency and speed of an electro-magnetic wave does not change on passing from one medium to another ?
(c) A thin ozone layer in the upper atmosphere is crucial for human survival on earth, why ?
(a) It is because the momentum transferred to our hands is extremely small. Hence we do not feel the pressure,
(b) frequency
(c) ozone layer prevents UV rays to penetrate the earth’s atmosphere.