Signal and System practice problem-3

If a signal \displaystyle f{{\left({t}\right)}} has energy E, the energy of the signal \displaystyle f{{\left({2}{t}\right)}} is equal to

(a) E
(b) E/2
(c) 2E
(d) 4E

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As the time is scaled by 2 so the energy will become half of its initial value … so answer b is correct or.E/2