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Physics - Modern Physics Question with Solution | TestHub

PhysicsModern PhysicsPhotoelectric effectMedium2 minQB

PhysicsMediumsingle choice

The time taken to prepare a print by exposing a small sheet to a point light source of 60 W placed at a distance of 25 cm from the sheet is 5 s. If the distance is increased to 40 cm, the time taken to prepare a similar print will be

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Answer:

Solution:

Equal photographic exposure needs It constant

$I \propto \frac{1}{r ^{2}} t_{2} = 5 (\frac{40}{25})^{2} = 12.8 s$

Stream:JEESubject:PhysicsTopic:Modern PhysicsSubtopic:Photoelectric effect

⏱ 2mℹ️ Source: QB

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