A photocell is illuminated by a small bright source placed 1 m away. When the same source of light is placed 1 2 m away, the number of electrons emitted by photocathode would

n ∝ I ∝ 1 r 2 ⇒ n 2 n 1 = r 1 r 2 2 = 1 1 2 2 = 4 ⇒ n 2 = 4 n 1

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Physics - Modern Physics Question with Solution | TestHub

PhysicsModern PhysicsPhotoelectric effectEasy2 minPYQ_2020

PhysicsEasysingle choice

A photocell is illuminated by a small bright source placed $1 m$ away. When the same source of light is placed $\frac{1}{2} m$ away, the number of electrons emitted by photocathode would

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Answer:

Solution:

$n \propto I \propto \frac{1}{r^{2}}$

$\Rightarrow \frac{n_{2}}{n_{1}} = {(\frac{r_{1}}{r_{2}})}^{2} = {(\frac{1}{\frac{1}{2}})}^{2} = 4$

$\Rightarrow n_{2} = 4 n_{1}$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Modern PhysicsSubtopic:Photoelectric effect

⏱ 2mℹ️ Source: PYQ_2020

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