Question

(1) A sound wave of wavelength 0.332m has a time period of 1/1000s. If the time period is decreased to 1/10000s, calculate the wavelength and frequency of the new wave.
(2) Why are infrared radiations preferred over ordinary visible light for taking photograph in fog?
(3) Why do diamonds shine?
(4)A tuning fork has two prongs. Why?

Answer 1

1) with the formula v= n /\ 2) infrared radiations fo not affect photographic films and provide some visibility. 3) due to total internal reflection when viewed from certain angles, ray of light travels from denser to rarer medium