Ultraviolet beam of wavelength 280 nm is incident on lithium surface of work function 2.5 eV. The maximum velocity of electron emitted from metal surf

Question

Ultraviolet beam of wavelength 280 nm is incident on lithium surface of work function 2.5 eV. The maximum velocity of electron emitted from metal surf

Ultraviolet beam of wavelength 280 nm is incident on lithium surface of work function 2.5 eV. The maximum velocity of electron emitted from metal surface is
A. `8.2 xx 10^(5) m//s`
B. `10^(6)m//s`
C. `7 xx 10^(5) m//s`
D. None of these

Monjur Alahi

4 views

2025-01-04 04:42

1 Answers

Related Questions

The work function for a metal is 4eV. To emit a photoelectron of zero velocity from the surface of the metal, the wavelength of incident light should

2 Answers 4 Views

The stopping potential for the photoelectrons emitted from a metal surface of work function 1.7 eV is 10.4 V. Find the wavelength of the radiation use

1 Answers 4 Views

When the light of wavelength `400 nm` is incident on a metal surface of work function `2.3 eV`, photoelectrons are emitted. A fasted photoelectron com

1 Answers 4 Views

Find the maximum magnitude of the linear momentum of a photoelectron emitted when light of wavelength 400 nm falls on a metal having work function 2.5

1 Answers 4 Views

A beam of white light is incident normally on a plane surface absorbing `70%` of the light and reflecting the rest. If the incident beam carries `30 W

1 Answers 4 Views

A light beam of wavelength `400 nm` is incident on a metal of work- function `2.2 eV`. A particular electron absorbs a photon and makes 2 collisions b

1 Answers 4 Views

Ultraviolet light is incident on two photosensitive materials having work function `W_(1)` and `W_(2) (W_(1) gt W_(2))`. In which case will the kintic

1 Answers 4 Views

The wavelength of the electron emitted by a metal sheet of work function 5eV when photons from EMR of wavelength 62 nm strike the metal plate

2 Answers 5 Views

A surface is irradiated with ultraviolet radiation of wavelength `0.2 mum`. If the maximum velocity of electron liberated from the surface is `8.8 xx

2 Answers 4 Views

Light of wavelength A which is less than threshold wavelength is incident on a photosensitive material. If incident wavelength is decreased so that em

2 Answers 4 Views

Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - A
`(hc)/(lambda)=phi+(1)/(2)mv_("max")^(2)`
`thereforev_("max")sqrt((2((hc)/(lambda)-phi))/(m))=sqrt((2(1242eV)/(280)-2.5 eV))`
`=sqrt(((2xx1.9xx1.6xx10^(-19))/(9.1xx10^(-31))))=8.2xx10^(5)m//s`

4 views Answered 2023-02-05 15:29