Sunday, July 27, 2014

Physics - Spectrum Questions



Q .1. Give one useful and one harmful effect of ultra violet radiation on the human
body. 
Q .2. Explain briefly how white light gets dispersed by a prism. 
Q .3. Name the extreme colours in a pure spectrum of light. 
Q .4. Name any four regions of electromagnetic spectrum (other than visible light)
in increasing order of wavelength.
Q .5. Name any two electromagnetic waves which have a frequency higher than that
of violet light. State one use of each.
Q .6. Why are infrared radiations preferred over ordinary visible light for taking
photograph in fog ?
Q .7. A TV station transmits waves of frequency 200 MHz. Calculate the wavelength of the waves if  their speed in air is 3.0 × 108 m s-1.
Q .8. a)State the equation for the relation between frequency and wavelength of light in vacuum.
b) How does the speed of light in glass change on increasing the wavelength of
light ?

No comments:

Post a Comment

Find Least Common Multiple (LCM). 1) 5 and 15 = ...