Question

Assertion : Cause of production of continuous X-rays is the loss in kinetic energy of electrons during collisions with different nuclei of target.

Reason : A decelerating charged particle radiates electromagnetic waves.

• A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion
• B. If both Assertion & Reason are True & the Reason is not a correct explanation of the Assertion
• C. If Assertion is True but the Reason is False
• D. If both Assertion & Reason are false

Answer 1

The correct option is A

If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion

Explanation for Assertion :

1. X-rays are electromagnetic waves with a wavelength less than about ${10}^{-9}m$.
2. Cathode rays are comprise of beam of electrons.
3. $\alpha -rays$ are made up of helium nucleus ${(i.e.,{}_2}^{4}H{e}^{2+})$, hence are made up of positively charged particles.
4. $\beta -rays$ are made up of energetic electrons, hence comprise of negatively charged particles.

Explanation for Reason :

1. An accelerated charge is the source of electromagnetic waves (EMWs).
2. When the charge is in a circular motion, the direction of its velocity continuously changes and thus it is in accelerated motion and produces EMWs.
3. A charge falling or decelerated charge in an electric field is accelerated by the electric force and thus produces EMWs.

Here, both Assertion & Reason are True & the Reason is a correct explanation of the Assertion

Hence option A is correct.