Question:
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R:
Assertion A: In the photoelectric effect electrons are ejected from the metal surface as soon as the beam of light of frequency greater than threshold frequency strikes the surface.
Reason R: When the photon of any energy strikes an electron in the atom transfer of energy from the photon to the electron takes place.
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R:
Assertion A: In the photoelectric effect electrons are ejected from the metal surface as soon as the beam of light of frequency greater than threshold frequency strikes the surface.
Reason R: When the photon of any energy strikes an electron in the atom transfer of energy from the photon to the electron takes place.
Assertion A: In the photoelectric effect electrons are ejected from the metal surface as soon as the beam of light of frequency greater than threshold frequency strikes the surface.
Reason R: When the photon of any energy strikes an electron in the atom transfer of energy from the photon to the electron takes place.
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In the photoelectric effect, the energy of the incident light must exceed a certain threshold to eject electrons from the metal surface.
Updated On: Mar 23, 2025
- Assertion A is correct but Reason R is not correct
- Assertion A is not correct and Reason R is correct
- Both A and R are correct and R is the correct explanation of A
- Both A and R are correct but R is NOT the correct explanation of A
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The Correct Option is A
Solution and Explanation
- Assertion A is correct. In the photoelectric effect, electrons are ejected when light of frequency greater than the threshold frequency strikes the surface of a metal.
- Reason R is incorrect because the process of energy transfer from the photon to the electron is not the sole factor that leads to the ejection of electrons. The frequency of the light is what matters, not just the energy of the photon.
Thus, the correct option is (1).
- Reason R is incorrect because the process of energy transfer from the photon to the electron is not the sole factor that leads to the ejection of electrons. The frequency of the light is what matters, not just the energy of the photon.
Thus, the correct option is (1).
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