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Q10 CQ

College Physics (Urone)
Found in: Page 1147

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Short Answer

Is it possible for light emitted by a scintillator to be too low in frequency to be used in a photomultiplier tube? Explain.

It would be no use.

See the step by step solution

Step by Step Solution

Step 1 Definition of photomultiplier tubes

Photomultiplier tubes, also known as electron multiplier tubes, are used to measure low light intensities by multiplying electrons by secondary emission. It can be used to measure the brightness of dim stars in astronomy, television camera tubes, and nuclear investigations to find and quantify tiny light flashes.

Step 2: Light emitted by scintillator

We know that when beam of photons strikes the metal then electrons are emitted. Only condition that matters is that the frequency of the light photons should be threshold frequency or more that.

So if the light emitted by scintillator has very low frequency, then no electrons would be emitted from the metal plate in the photomultiplier tube. Therefore it would be no help to use light of very low frequency in a photomultiplier tube.

Therefore, It would be no use.

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