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What is the following graph, if del(t) represents the impulse function?

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What is the following graph, if del(t) represents the impulse function?

(a) del(t)

(b) del(t-100)

(c) del(t+100)

(d) del(t-50)

The question was posed to me in an online quiz.

I would like to ask this question from Operations on Signals topic in portion Digital Signal Processing of MATLAB

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The correct answer is (b) del(t-100)

Easy explanation: The above graph shows the impulse function at t=+100. This means that the function has been delayed by 100 units of time. Hence, the correct option is del(t-100).

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