A band-limited signal with a maximum frequency of 5 kHz

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A band-limited signal with a maximum frequency of 5 kHz is to be sampled. According to the sampling theorem, the sampling frequency in kHz which is not valid is

1. 2
2. 12
3. 15
4. 20

Correct Option: A

As ƒ_max = 5 kHz
ƒ sampling ≥ 2 ƒ_max = 2 ƒ_max = 10 kHz
Not 12, 15, 20 kHz a valid samply frequency so sampling frequency ƒ_s, such is not valid sampling frequency.