Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R:

Photoelectric Effect – Assertion Reason | JEE Main PYQ | Structure of Atom

Q. 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, the 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:

Correct Answer: A is correct but R is not correct

Explanation

Assertion A is correct because photoelectric emission occurs instantaneously when incident light has frequency greater than the threshold frequency.

Reason R is incorrect because energy transfer from photon to electron does not occur for photons of any energy; the photon energy must be greater than or equal to the work function.

Hence, Assertion is correct but Reason is not correct.

Previous Year Questions – Structure of Atom

The number of incorrect statement/s about the black body from the following is ______.

The number of atomic orbitals from the following having 5 radial nodes is ______. (7s, 7p, 6s, 8p, 8d)

The wavelength of an electron of kinetic energy 4.50 × 10⁻²⁹ J is ______ × 10⁻⁵ m. (Nearest integer)

If the radius of the first orbit of hydrogen atom is a₀, then de Broglie's wavelength of electron in 3rd orbit is:

The number of radial node/s for 3p orbital is:

JEE Main Chapter-wise PYQs – Physics & Chemistry