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BITSAT 2019 Physics Modern Physics Revision Quiz 2

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Question 1

When a point source of light is at a distance of one meter from a photo cell, the cut off voltage is found to be V. If the same source is placed at 2 m distance from photo cell, the cut off voltage will be -

Question 2

The stopping potential (V0) -

Question 3

50% of the X-ray coming from a Cooldige tube is able to pass through a 0.1 mm thick aluminium foil. The potential difference between the target and the filament is increased. The thickness of aluminium foil, which will allow 50% of the X-ray to pass through, will be-

Question 4

A photon of frequency f causes the emission of a photoelectron of maximum kinetic energy EK from a metal. If a photon of frequency 3f is incident on the same metal, the maximum kinetic energy of the emitted photoelectron

Question 5

The anode voltage of a photocell is kept fixed. The wavelength λ of the light falling on the cathode is gradually changed. The plate current I of the photocell varies as follows :

Question 6

A photocell is illuminated by a small bright source placed 1 m away. When the same source of light is placed 1/2 m away, the number of electrons emitted by photo cathode would

Question 7

This question has statement 1 and statement 2. Of the four choices given after the statements, choose the one that best describes the two statements
Statements 1: Davisson – germer experiment established the wave nature of electrons
Statement 2: If electrons have wave nature, they can interfere and show diffraction.
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May 6JEE & BITSAT