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Physics - Modern Physics Question with Solution | TestHub

PhysicsModern PhysicsPhotoelectric effectMedium2 minPYQ_2009

PhysicsMediumsingle choice

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 second on the average at a target irradiated by this beam is :NEET 2009 (Mains)

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Answer:

Solution:

$No. of photons = \frac{E}{( hc / λ )} = \frac{9 \times 1 0 ^{- 3} \times 6.67 \times 1 0 ^{- 7}}{6.6 \times 1 0 ^{- 34} \times 3 \times 1 0 ^{8}} = 3 \times 1 0^{16}$

Stream:NEETSubject:PhysicsTopic:Modern PhysicsSubtopic:Photoelectric effect

⏱ 2mℹ️ Source: PYQ_2009

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