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.

In the light of the above statements, choose the most appropriate answer from the options given below:

A is correct but R is not correct

The correct answer is Option 3: Assertion A is correct, but Reason R is not correct.

Given are two statements:

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. - This statement is mostly correct.

For light of a frequency greater than the threshold frequency, electrons are indeed ejected immediately upon absorbing a photon with sufficient energy.

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. - This statement is incorrect.

Light can interact with an atom in various ways, and the transfer of energy depends on the specific scenario. In the photoelectric effect, only photons with enough energy (greater than or equal to the threshold frequency) can eject an electron. Lower energy photons might not transfer any energy or may excite the electron to a higher energy level within the atom.

Therefore, while the assertion (A) is mostly correct, the reason (R) is not entirely accurate in the context of photoelectric effect. The transfer of energy only happens when the photon has sufficient energy to eject the electron.

Therefore, the correct answer is: Option 3: Assertion A is correct, but Reason R is not correct.