7A. How fast a person should drive his car so
the red signal of light appears green?
(Wavelength for red colour - 6200 Å
wavelength for greeen colour - 5400 Å)
1) 1.5x108 m/s 2) 7x10?m/s
3) 3.9x10’m/s 4) 2x108 m/s
star is moving towards the earth u
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3 rd option is correct IE 3.9 X 10'7
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