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Physics - Modern Physics Question with Solution | TestHub

PhysicsModern PhysicsAtomic structureEasy2 minPYQ_2020

PhysicsEasysingle choice

A laser light of wavelength $660 nm$ is used to weld Retina detachment. If a laser pulse of width $60 ms$ and power $0 .5 kW$ is used, the approximate number of photons in the pulse are (Take Planck's Constant, $h = 6.62 \times 10^{- 34} J s)$

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Answer:

Solution:

Power P is given as ,

$P = \frac{nhc}{λt}$ , $n = \frac{Pλt}{hc}$

$= 0.5 \times 10^{3} \times \frac{660 \times 10^{- 9} \times 60 \times 10^{- 3}}{6.6 \times 10^{- 34} \times 3 \times 10^{8}}$

$= 100 \times 10^{18} = 10^{20}$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Modern PhysicsSubtopic:Atomic structure

⏱ 2mℹ️ Source: PYQ_2020

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