Home
Class 12
PHYSICS
In an experiment tungsten cathode which ...

In an experiment tungsten cathode which has a threshold `2300 Å` is irradiated by ultraviolet light of wavelength `1800Å`. Calculate
(i) Maximum energy of emitted photoelectron and
(ii) Work function for tungsten.
(Mention both the results in electron-volts)
Given Planck's constant `h=6.6 xx 10^(-34) J-sec`, `1eV = 1.6 xx 10^(-19) J` and velocity of light `c= 3xx10^(8)m//sec`

A

`0.15eV`

B

`1.5eV`

C

`15 eV`

D

`150eV`

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Similar Questions

Explore conceptually related problems

Work function of a metal is 3.0 eV. It is illuminated by a light of wavelength 3 xx 10^(-7) m. Calculate the maximum energy of the electron.

Calculate the energy in MeV equivalent to the rest mass of an electron . Given that the rest mass of an electron , m=9.1 xx 10^(-31) kg , 1MeV = 1.6 xx 10^(-13) J and speed of light , c= 3 xx 10 ^(8) ms ^(-1) .

Calculate the energy in joule corresponding to light of wavelength 45 nm : ("Planck's constant "h=6.63 xx 10^(-34)" Js: speed of light :"c =3 xx 10^8 "ms"^(-1)) .

A 2 mW laser operates at a wavelength of 500 nm. The number of photons that will be emitted per second is: [Given Planck’s constant h = 6.6 xx 10^(-34)Js , speed of light c = 3.0 xx 10^(8) m//s ]

For given enegy, corresponding wavelength will be E = 3.03 xx 10^(-19) Joules (h = 6.6 xx 10^(-34) j X sec., C = 3 xx 10^(8) m/sec

Find the maximum velocity of photoelectrons emitted by radiation of frequency 3 xx 10^(15) Hz from a photoelectric surface having a work function of 4.0 eV. Given h=6.6 xx 10^(-34) Js and 1 eV = 1.6 xx 10^(-19) J.

The work function of potassium is 2.0 eV. When it is illuminated by light of wavelength 3300A^(@) photo electrons are emitted. The stopping potential of photo electrons is [Plank’s constant h=6.6 xx 10^(-34)Js,1eV=1.6 xx 10^(-19)J,C=3 xx 10^(8)ms^(-1) ]

A metal surface having a work function phi = 2.2 xx 10^(-19) J , is illuminated by the light of wavelengh 1320Å . What is the maximum kinetic energy ( in eV ) of the emitted photoelectron ? [Take h = 6.6 xx 10^(-34) Js ]

A metal surface having a work function phi = 2.2 xx 10^(-19) J , is illuminated by the light of wavelengh 1320Å . What is the maximum kinetic energy ( in eV ) of the emitted photoelectron ? [Take h = 6.6 xx 10^(-34) Js ]