Question

When the accelerating voltage in an X-ray tube is doubled, the wavelength of the X-rays is

a. Increased to twice the original value

b. Is increased to four times the original value

c. Decreased to one-half the original value

d. Decreased to one-forth its original value

Explain

Answer 1

Solution:

Using conservation of energy

=> e V = hc/wavelength

We can say voltage is inversely dependent on wavelength

=> wavelength = K/V where k is a constant

=> when V is doubled wavelength will decrease by one half

Option c is right