Which statement (s) is(are) true for photomultiplier tubes? Photo multiplier tub

Question

Which statement (s) is(are) true for photomultiplier tubes? Photo multiplier tubes are very sensitive detectors, amplifying the photoelectron current by approximately 1 million. Emitted photoelectrons are accelerated to positively charged electrodes called dynodes. Electrons strike the dynode with a kinetic energy less than the original emitted kinetic energy. For each electron striking a dynode, more than one electron is knocked free. The additional electrons are accelerated toward the next dynode in the detector where amplification is repeated. II, III, and IV II and III I and IV II I, II, and IV

Explanation / Answer

1. These detectors multiply the current produced by incident light by as much as 100 million times.

2 By recieving energy from the incoming photon, electrons leave the photocathode and they move towards the first dynode and they are accelerated by the electric field.

3.The photoelectron emmited by the photocathode arrive with much greater energy than they left the cathode.

4.When they strike the first dynode more low energy electrons are released, and these are in turn attracted by the greater positive field of the next dynode.

a. answer is correct

option II, III and IV are correct

therefore

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