Скачать или смотреть JEE Advance 2020 P2 Q10 Modern Physics

In an X-ray tube, electrons emitted from a filament (cathode) carrying current I hit a target (anode) at a distance d from the cathode. The target is kept at a potential V higher than the cathode resulting in emission of continuous and characteristic X-rays. If the filament current I is decreased to 𝑰/𝟐, the potential difference V is increased to 2V, and the separation distance d is reduced to 𝒅/𝟐,
(a) the cut-off wavelength will reduce to half, and the wavelengths of the characteristic X-rays will remain the same
(b) the cut-off wavelength as well as the wavelengths of the characteristic X-rays will remain the same
(c) the cut-off wavelength will reduce to half, and the intensities of all the X-rays will decrease
(d) the cut-off wavelength will become two times larger, and the intensity of all the X-rays will decrease
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