Modern Physics Ques 163
Assertion and Reason
Mark your answer as
(a) If Statement I is true, Statement II is true; Statement II is the correct explanation for Statement I.
(b) If Statement I is true, Statement II is true; Statement II is not a correct explanation for Statement I.
(c) If Statement I is true; Statement II is false.
(d) If Statement I is false; Statement II is true.
- Statement I If the accelerating potential in an X-ray tube is increased, the wavelengths of the characteristic X-rays do not change
Statement II When an electron beam strikes the target in an X-ray tube, part of the kinetic energy is converted into $X$-ray energy.
Show Answer
Answer:
Correct Answer: 163.(b)
Solution:
- Cut-off wavelength depends on the accelerating voltage, not the characteristic wavelengths. Further, approximately $2 \%$ kinetic energy of the electrons is utilised in producing $X$-rays. Rest $98 \%$ is lost in heat.
BETA
