A monochromatic source of light operating at 200W
emits 4 xx (10^20) photons per second. Find the wavelength
of the light.
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Answer:
E=nhc/λ
for 1s E=P
200= 4 * 10^20 *hc/λ
λ=2*10^18*hc
put h=6.63*10^-34 and c=3*10^8
λ=3.98*10^-7 metre
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