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The wavelength detected by photodiode should be less than λmax. Hence it can detect a signal of wavelength 4000 Å.

1. True
2. False
3. Cannot be determined
4. None of the above

Correct answer: True

Solution

The statement is true because a photodiode can only detect wavelengths shorter than its maximum threshold (λmax). If λmax is greater than 4000 Å, the photodiode can detect the signal.

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