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IMPORTANT
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A metal surface is irradiated by light of wavelength,. The most energetic emitted photoelectrons are bent in a circle of radius by a magnetic field of T perpendicular to the velocity. Then
(a)The most energetic photoelectrons have energy close to
(b)The most energetic photoelectrons have energy close to
(c)The work function of the metal is close to
(d)The work function of the metal is close to

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Important Questions on Dual Nature of Radiation and Matter
EASY
JEE Main/Advance
IMPORTANT
A point source of light emitting power is placed inside at the center of a soap bubble of radius Surface of soap bubble is perfectly absorbing and is the atmospheric pressure. If is the radiation pressure on the surface of soap bubble due to point source and is the net pressure inside the soap bubble having surface tension , then choose the correct answer is the speed of light)

MEDIUM
JEE Main/Advance
IMPORTANT
A beam of light of intensity is incident on a plane mirror and get reflected fully as shown in figure. The pressure exerted by beam on the mirror is ( : speed of light)

EASY
JEE Main/Advance
IMPORTANT
A photosensitive metal plate is exposed to a monochromatic light beam of frequency which is more than threshold frequency. Then plot of versus , is best represented by No. of photoelectrons, kinetic energy of photoelectron]

EASY
JEE Main/Advance
IMPORTANT
When light of wavelength is incident on a metal surface, the stopping potential is found to be . When light of wavelength is incident on the same metal surface, the stopping potential is found to be . The cut off wavelength for the metal is given by

EASY
JEE Main/Advance
IMPORTANT
A metal surface is illuminated by light of two different wavelengths and . The maximum speed of ejected photoelectrons corresponding to these wavelengths are in the ratio . Then work function of the metal is nearly

EASY
JEE Main/Advance
IMPORTANT
When a metal surface is illuminated with a radiation of wavelength , the maximum kinetic energy of photoelectrons emitted is . When the same surface is illuminated by radiation of wavelength , the maximum kinetic energy of photoelectrons become . Then

MEDIUM
JEE Main/Advance
IMPORTANT
Assertion : Work function of aluminium is Emission of electrons will not be possible if two photons each of energy collide with free electrons of aluminium.
Reason : For photoelectric emission the energy of each photon should be greater than or equal to the work function of aluminium.

EASY
JEE Main/Advance
IMPORTANT
A perfectly reflecting solid sphere of radius is kept in the path of a parallel beam of light of large aperture. If the intensity of the beam is the force exerted by the beam on the sphere in scientific notation is The value of is
