Question

In an x-ray tube, electrons striking a target are brought to rest, causing x-rays to be emitted. In a particular x-ray tube, the maximum frequency of the emitted continuum x-ray spectrum is f_o. If the voltage across the tube is doubled, the maximum frequency is

A) f_o/2 

B) f_o/√2 

C) f_o 

D) √2 f_o 

E) 2f_o

Answer 1

The correct option is: (E) 2f_o

Explanation:

The energy of the electrons is the kinetic energy given by W = Vq = K. Doubling the voltage doubles the energy of the electrons. The emitted x–ray energy coming from the electron energy is given by E = hf and with double the energy there should be double the frequency.