Question

The rate of emission of thermions is the Work Function of the metal.

• A. independent of
• B. inversely proportional to
• C. directly proportional to
• D. None of these

Answer 1

Answer: (B)

inversely proportional to

More is the work function of the metal, more will be the electrons bound with the nucleus. Due to this, more energy is required to emit the electrons (thermions). Hence the rate of emissions of thermions is less.

So, the rate of emissions of thermions is inversely proportional to the work function of the metal.