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Physics - Modern Physics Question with Solution | TestHub

PhysicsModern PhysicsPhotoelectric effectMedium2 minQB

PhysicsMediumsingle choice

A metal plate when exposed to light of wavelength 310 nm , photoelectrons are ejected. When a retarding electric field of intensity $E = 100 N / C$ is applied, none of the photoelectrons can move away from the plate farther than 1 cm. Which of the following is a correct value for the threshold wavelength?

Options:

Answer:

Solution:

$K_{ma x} = e E d = 100 \times 0.01 = 1 eV$

Photon energy: $\frac{1240}{310} = 4 eV$

$ϕ = 4 - 1 = 3 eV$

$λ_{0} = \frac{1240}{3} = 413.33 nm$

Option (A)

Stream:JEESubject:PhysicsTopic:Modern PhysicsSubtopic:Photoelectric effect

⏱ 2mℹ️ Source: QB

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