How many photons of light having a
wavelength of 5000A° are necessary to provide
1J energy ?
(1) 2.5 10^18
(2) 2.5 x 10^25
(3) 5 x 10^25
(4) 5 x 10^28
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Answer:
ans (2) 2.5 ×10^25 to provide 1J energy
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