Question

Assertion: The phenomenon of X-ray production is basically inverse of photoelectric effect.
Reason: X-rays are electromagnetic rays.
A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
C. Assertion is correct but Reason is incorrect.
D. Both Assertion and Reason are incorrect.

Answer 1

Hint: X-rays are the rays of shorter wavelength compared to other electromagnetic waves of electromagnetic spectrum but photoelectric effect is a process in which a beam of photons is incident on the surface of a body resulting in electron’s emission. In both the processes the beam of rays is an electromagnetic wave.

Complete answer:
Photoelectric effect: It is the phenomena of emission of electrons from the surface of a body when a beam of light (photon) is incident on its surface. Photoelectrons is the word given to the electrons emitted during this phenomenon.

X-rays: These are the electromagnetic waves emitted from the surface of a body due to the ionization when a beam of electron is incident on its surface. These are also called X-radiation.

By clearly understanding the meaning of photoelectric effect and X-rays, it can be stated that the phenomenon of production of X-ray is inverse of photoelectric effect.Also, from the definition of X-rays, it can be said that X-rays are electromagnetic rays which is a separate statement, not the explanation for Assertion.

Therefore, option B that is both Assertion and Reason are correct, but Reason is not the correct explanation for Assertion.

Note: It has to be noted that the assertion statement is about x-ray production and photoelectric effect so we have clearly established a relationship between them and explained whether it is correct or not. To solve this kind of problem we can understand the assertion and reason statements carefully and find out if they are having any relationship or not, as in our problem both assertion and reason are correct but reason is an independent statement.