If frequency of incident light falling on photo emissive plate is doubled. Kinetic energy of emitted photoelectron is:
Correct answer: B. More than double
- A. Doubled
- B. More than double
- C. Unchanged
- D. Less than double
Explanation
More than double: From Einstein's equation for photoelectric effect , the maximum kinetic energy , K=hν−W where ν= frequency of incident light , h= Planck's constant and W= work function of metal. When ν is made double, K =2hν−W=2(hν−W)+W=2K+W Thus, kinetic energy of photoelectrons will be more than doubled when incident frequency is doubled.
This question appeared on the ETEA MDCAT 2009 paper, which you can sit online with every answer explained.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Photons and the Particle Model of Light
The particle model treats light as photons with energy E equals hf and momentum related to wavelength. Questions involve the photoelectric effect, work function, threshold frequency, stopping potential and photon energy, while distinguishing particle behaviour from the wave description of interference and diffraction.
Practise Dawn of Modern Physics
739 free Dawn of Modern Physics MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Photons and the Particle Model of Light questions
Pair production can take place only if the energy E of the photon is:
The number of photoelectrons emitted per second from the metal surface depends upon
The maximum KE of an emmitted photoelectrons depends on:
The scientist who was awarded the Noble Prize for explaining the photoelectric effect
The scattering angle for which the Compton shift in wavelength is equal to Compton wavelength is:
The maximum kinetic energy of an electron ejected from a metal by a photon depends on: