Back to DUAL NATURE OF RADIATION AND MATTER
JEE PHYSICS MCQ: DUAL NATURE OF RADIATION AND MATTER
1
Medium
1 of 1
Understanding
+4 | -1
Assertion: When photons of frequency is incident on the surface of threshold frequency then no photoelectron emitted from the surface.
Reason: Number of electrons ejected depends on intensity.
Reason: Number of electrons ejected depends on intensity.
View answer and explanation
Correct option: B
If both Assertion and Reason are true but Reason is not a correct explanation of the Assertion
Option B is correct because both the assertion and the reason are true, but the reason does not explain the assertion. The assertion is based on the frequency of incident photons compared to the threshold frequency, while the reason concerns the intensity of light.
More Questions from DUAL NATURE OF RADIATION AND MATTER
Practice All Chapter MCQs →
The electrons are emitted in the photoelectric effect from a metal surface
What is the de Broglie wavelength of a bullet of mass 0.04 kg travelling at the speed of 1 km/s?
Photoelectrons are emitted from a metal surface when UV light of wavelength is incident on it. The minimum negative potential required to stop the emission of electrons is . Calculate:
(i) the energy of the incident photons
(ii) the maximum kinetic energy of the photoelectrons emitted. An electron is accelerated by a potential difference of V volt to acquire kinetic energy equal to maximum kinetic energy of ejected photoelectron from a metal of work function 3.2 eV, using a light of wavelength Value of V is Two monochromatic beams and of equal intensity , hit a screen. The number of photons hitting the screen by beam is twice that by beam . Then, what can inference you about their frequencies? A 5 W source emits monochromatic light of wavelength . When placed 0.5 m away, it liberates photoelectrons from a photosensitive metallic surface. When the source is moved to a distance of 1.0m, the number of photoelectrons liberated will be reduced by a factor of
(i) the energy of the incident photons
(ii) the maximum kinetic energy of the photoelectrons emitted. An electron is accelerated by a potential difference of V volt to acquire kinetic energy equal to maximum kinetic energy of ejected photoelectron from a metal of work function 3.2 eV, using a light of wavelength Value of V is Two monochromatic beams and of equal intensity , hit a screen. The number of photons hitting the screen by beam is twice that by beam . Then, what can inference you about their frequencies? A 5 W source emits monochromatic light of wavelength . When placed 0.5 m away, it liberates photoelectrons from a photosensitive metallic surface. When the source is moved to a distance of 1.0m, the number of photoelectrons liberated will be reduced by a factor of