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Question:

An electron beam is accelerated by a potential difference V to hit a metallic target to produce X-rays. It produces continuous as well as characteristic X-rays. If λmin is the smallest possible wavelength of X-rays in the spectrum, the variation of log λmin with log V is correctly represented in :

Solution:

We have, eV = hν + K.E
eV = hc/λmin + K.E
log V + K.E = -log λmin
Hence log V is inversely proportional to log λmin