Modern Physics Ques 173
- When the number of electrons striking the anode of an X-ray tube is increased the …….. of the emitted X-rays increases, while when the speeds of the electrons striking the anode are increased the cut-off wavelength of the emitted X-rays ………
(1986, 2M)
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Answer:
Correct Answer: 173.(Intensity, decrease)
Solution:
- Cut-off wavelength is given by
$ \lambda _{\min }=\{\frac{12375}{V(\text { in volts })} \} \text { (in } \AA) $
with increase in applied voltage $V$, speed of electrons striking the anode is increased or cut-off wavelength of the emitted $X$-rays decreases.
Further, with increase in number of electrons striking the anode more number of photons of X-rays will be emitted. Therefore, intensity of X-rays will increase.
BETA
