Practice portal › Dual Nature of Matter and Radiation › Conceptual and Statement Questions on the Photoelectric Effect

This question has Statement-1 and Statement-2. Of the four choices given after the statements, choose the one that best describes the two statements. Statement-1: When ultraviolet light is incident on a photocell, its stopping potential is V₀ and the maximum kinetic energy of the photoelectrons is Kₘₐₓ. When the ultraviolet light is replaced by X-rays, both V₀ and Kₘₐₓ increase. Statement-2: Photoelectrons are emitted with speeds ranging from zero to a maximum value because of the range of frequencies present in the incident light.

Asked in AIEEE 2010 · Assertion, reason and statements

Answer: (1) Statement-1 is true, Statement-2 is false.

Step-by-step solution

Statement-1: X-rays have a much higher frequency than ultraviolet, so Kₘₐₓ=h u-φ and V₀ both rise. True.

Statement-2: the light is monochromatic, so there is no range of frequencies.

The spread of speeds comes from electrons losing different amounts of energy on their way out of the metal. False.

Why the other options are wrong

More Conceptual and Statement Questions on the Photoelectric Effect questionsAll Conceptual and Statement Questions on the Photoelectric Effect questions →

Reading this solution needs no sign-in. You only sign in to practise against the clock and keep your progress.

Practise this with a timer