The energy required to stop ejection of electrons from a Cu plate is `0.24` eV.Calculate the work function Cu when a radiation of wavelength `lambda =

Question

The energy required to stop ejection of electrons from a Cu plate is `0.24` eV.Calculate the work function Cu when a radiation of wavelength `lambda =

The energy required to stop ejection of electrons from a Cu plate is `0.24` eV.Calculate the work function Cu when a radiation of wavelength `lambda = 250` nm strikes the plate.
A. 24.3 eV
B. 24 eV
C. 4.65 eV
D. 4.95 eV

Monjur Alahi

4 views

2025-01-04 04:42

1 Answers

Related Questions

A parallel plate capacitor of plate are A and plate separation d is charged by a battery of voltage V. The battery is then disconnected. The work need

2 Answers 5 Views

A parallel plate capacitor with plate area A and plate separation d, is charged by a constant current I. Consider a plane surface of area `A//2` paral

2 Answers 5 Views

A parallel plate capacitor having plate area `0.5 m^(2)` and plate separation of 5 mm is complete filled with a dielectric of dielectric constant 10.

2 Answers 4 Views

An X-ray tube produces a continuous spectrum of radiation with its short wavelength end at `0.45Ã…`. The maximum energy of a photon in the radiation i

2 Answers 5 Views

The threshold wavelength for the ejection of electrons from the metal X is 330 nm. The work function for the photoelectric emission for metal X is `(h

2 Answers 4 Views

Radiation of intensity `1 W//m^(2)` are striking on a metal plate. The pressure on the plate is

2 Answers 4 Views

A sphere of work function `phi=4.6 eV` is suspended in a vacuum number by an insulating thread. Radiation of wavelength `lambda =0.2 mum` stricke on t

2 Answers 5 Views

When light of wavelength `lambda` is incident on a metal surface, stopping potential is found to be x. When light of wavelength n`lambda` is incident

2 Answers 8 Views

Photoelectric effect takes place in element A. Its work funcation is `2.5 eV` and threshold wavelength is `lambda`. An other element B is having work

2 Answers 7 Views

The stopping potential for the photo-electrons emitted from a metal surface of work-function 1.7 eV is 10.4 eV. Find the wavelength of the radiation u

2 Answers 5 Views

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

Correct Answer - B
Energy of Photon =work function + K.E. =work function + `eV_0`â€¦(1)
where e=electronic charge
`V_0`=Stopping potential and `eV_0` is equal to energy required to stop ejection of electron.
E/photon =hc/`lambda`
`=(6.626xx10^(-34)xx3xx10^8)/(253.7xx10^(-9))`
`=7.835xx10^(-19)J`
`=(7.835xx10^(-19))/(1.602xx10^(-9))`eV
=4.89 eV
So, from (1),
4.89=Work function + 0.24
work function = 4.65 eV