HARD
JEE Main
IMPORTANT
Earn 100
The radiation corresponding to transition of hydrogen atom falls on a metal surface to produce photoelectrons. These electrons are made to enter a magnetic field of . If the radius of the largest circular path followed by these electrons is 10.0 mm, the work function of the metal is close to :
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Important Questions on Dual Nature of Matter and Radiation
MEDIUM
JEE Main
IMPORTANT
The anode voltage of a photocell is kept fixed. The wavelength of the light falling on the cathode is gradually changed. The plate current of the photocell varies as follows :
EASY
JEE Main
IMPORTANT
When light of frequency twice the threshold frequency is incident on the metal plate, the maximum velocity of emitted electron is . When the frequency of incident radiation is increased to five times the threshold value, the maximum velocity of emitted electron becomes . If , the value of will be _____ .
EASY
JEE Main
IMPORTANT
The light of two different frequencies whose photons have energies and respectively, illuminate a metallic surface whose work function is successively. The ratio of maximum speeds of emitted electrons for the two frequencies respectively will be :
MEDIUM
JEE Main
IMPORTANT
Given below are two statements :
Statement I : Davisson-Germer experiment establishes the wave nature of electrons.
Statement II : If electrons have wave nature, they can interfere and show diffraction.
In the light of the above statements choose the correct answer from the option given below :
EASY
JEE Main
IMPORTANT
A proton, a neutron, an electron and an -particle have same energy. If and are the de Broglie's wavelengths of proton, neutron, electron and particle respectively, then choose the correct relation from the following
HARD
JEE Main
IMPORTANT
A metal surface is illuminated by a radiation of wavelength . The ejected photo-electron enters a constant magnetic field of making an angle of with the magnetic field. If it starts revolving in a circular path of radius , the work function of the metal is approximately
HARD
JEE Main
IMPORTANT
The stopping potential for photoelectrons emitted from a surface illuminated by light of wavelength is . If the threshold frequency is , where is (nearest integer): (Given, speed light . Planck's constant )
MEDIUM
JEE Main
IMPORTANT
An electron with speed $v$ and a photon with speed have the same de-Broglie wavelength. If the kinetic energy and momentum of electron are and and that of photon are and respectively. Which of the following is correct?
