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QAIPMT-2009-Ph-2184: NEET 2009 Physics - Class 12 AIPMT-2009-Ph-2184 Solution: Monochromatic light of wavelength 667 nm is produced by a…

Monochromatic light of wavelength 667 nm is produced by a helium neon laser. The power emitted is 9 mW. The number of photons arriving per sec. on the average at a target irradiated by this beam is

Multiple Choice Options

A $3\times10^{16}$
B $9\times10^{15}$
C $3\times10^{19}$
D $9\times10^{17}$

Step-by-Step Verified Solution

Number of photons = E h c _ = 9 _ 10 _ 3 _ 6.67 _ 10 _ 7 6.6 _ 10 _ 34 _ 3 _ 10 8 = 3 _ 10 16

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