Physics - Modern Physics Question with Solution | TestHub

PhysicsModern PhysicsPhotoelectric effectEasy2 minPYQ_2020

PhysicsEasysingle choice

Light of wavelength $3000 Å$ is incident on a metal surface whose work function is $1 eV$ . The maximum velocity of emitted photoelectrons will be

Options:

Answer:

Solution:

$\frac{1}{2} m v^{2} = \frac{h c}{λ} - ϕ_{0}$

$= \frac{6.63 \times 10^{- 34} \times 3 \times 10^{8}}{(3 \times 10^{- 7}) \times 1.6 \times 10^{- 19}} - 1$

$= 4.14 - 1 = 3.14 e V$

or $v = \sqrt{\frac{2 \times 3.14 \times 1.6 \times 10^{- 19}}{9.1 \times 10^{- 31}}} = 10^{6} m s^{- 1}$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Modern PhysicsSubtopic:Photoelectric effect

⏱ 2mℹ️ Source: PYQ_2020

Doubts & Discussion

Loading discussions...