Which of the following would produce analog signals and which would produce digital signals?

Options

A. A vibrating tuning fork
B. Musical sound due to a vibrating sitar string.
C. Light pulse.
D. Output of NAND gate.

Answer

A, D

Explanation

Vibrating tunning fork and string produces all possible values of displacement hence, these signals are analog.
A light pulse and output of NAND gate gives only discreate values of output, So signals are digital these.