Dual Nature of Matter and Radiation Test

Result

Dual Nature of Matter and Radiation Test - 2

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Question 1
1 / -0

A metal surface ejects electrons when hit by green light, but none when hit by yellow light. The electrons will be ejected when the surface is hit by

A
orange light

B
blue light

C
red light

D
infrared light

Solution

Here, photoelectrons will be ejected by light having smaller wavelength than the wavelength of green light. Blue colour has wavelength smaller than the wavelength of green light, so photoelectrons will be ejected.
Question 2
1 / -0

The following question has four choices out of which ONLY ONE is correct.

A light having wavelength 300 nm falls on a metal surface. Work function of metal is 2.54 eV. What is the stopping potential?

A
2.3 V

B
2.59 V

C
1.60 V

D
1.29 V

Solution

Energy of photon = 1243 / 300 = 4.14eV
work function= 2.54eV
Kinetic energy=4.14-2.54=1.60eV
stopping potential=1.6v
Question 3
1 / -0

The following question has four choices, out of which ONLY ONE is correct:

The photoelectric effect is based on the law of conservation of

A
linear momentum

B
energy

C
angular momentum

D
mass

Solution

The photoelectric effect is based on the law of conservation of energy.
Energy of the emitted photon = Energy of the incident photon - Work Function