Multiple choice

Which of the following is not true for a photomultiplier tube (PMT)?

  1. PMTs have high internal gain.

  2. The working of PMT is based upon photoelectric effect.

  3. The material of photocathode is usually a mixture of alkali metals

  4. The dynodes are maintained at successively more negative potential.

  5. The response of a PMT is linear.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This option is correct as the given statement is wrong regarding PMTs since dynodes are additional electrodes which are maintained at successively less  negative potential  which leads to generation of additional electrons thus multiplying the primary current.

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