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A monochromatic source of light operatin...

A monochromatic source of light operating at 200W
emits `4 xx (10^20)` photons per second. Find the wavelength
of the light.

Text Solution

Verified by Experts

The energy of each photon = `(200 J(s^-1)/ 4 xx (10^20)(s^-1))`
`= 5 xx (10^-19)J. `
`Wavelength= lambda= hc/E `
` = ((6.63 xx (10^-34)J s) xx (3 xx (10^8)m(s^-1))/ ( 5 xx (10^-19)J)) `
` = 4.0 xx (10^-7)m= 400 n m. `
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