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JEE 2020 Physics: Particle Nature of Light: The Photon & Photoelectric Effect Quiz (26.09.2019)

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Question 1

A stream of photons having energy 3eV each impinges on a potassium surface. The work function of potassium is 2.3eV. The emerging photo-electrons are slowed down by a copper plate placed 5mm away. If the potential difference between the two metal plated is 1V, the maximum distance the electrons can move away from the potassium surface being turned back is

Question 2

A light source is emitting photons. A metallic surface is illuminated alternatively with the light of energies 5.0 eV and 2.5 eV. The ratio of maximum velocities of the photoelectrons emitted in two cases is 2. The work function

of the metal (in eV) is

Question 3

The work function of a substance is 4.0 eV. The longest wavelength (in nm) of light that can cause photoelectron emission from this substance is approximately

Question 4

A metallic plate of mass 25 gm is in equilibrium in air due to the force exerted by a light beam on the plate. The power of the beam is n × 10⁶ W. Find the value of n.

Question 5

STATEMENT – 1
When ultraviolet light is incident on a photocell, its kinetic energy of the photoelectrons is K_max. When the ultraviolet light is replaced by X–rays, both V₀ and K_max increase.
STATEMENT – 2
Photoelectrons are emitted with speeds ranging from zero to a maximum value because of the range of frequencies present in the incident light.

Question 6

Two identical photo cathodes receive light of frequencies f₁ and f₂. if the velocities of the photoelectrons (of mass m) coming out are respectively v₁ and v₂, then

Question 7

Silver has a work function of 4.7 eV. When ultraviolet light of wavelength 100 nm is incident upon it, potential of 7.7 V is required to stop photoelectrons from reaching the collector plate. The potential required to stop electrons when light of wavelength 200 nm is incident upon silver is

Question 8

The maximum velocity of electrons emitted from the metal surface of negligible work function is v, when frequency of light falling on it is f. The maximum velocity when frequency becomes 4f is

Question 9

During charging a capacitor, variations of potential V of the capacitor with time t is shown as

Question 10

The stopping potential for photoelectrons from a metal surface is V₁ when monochromatic light of frequency v₁ is incident on it. The stopping potential become V₂ when monochromatic light of another frequency is incident on the same metal surface. If h be the Plank’s constant and e be the charge of an electron, then the frequency of light in the second case is

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Jun 1JEE & BITSAT