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Ask community Community Discussion Question: If a signal f (t) has energy E, the energy E, the energy of the signal f (2t) is equal to
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[Post New] 23 Mar 2009 12:19:49 IST
   Subject: If a signal f (t) has energy E, the energy E, the energy of the signal f (2t) is equal to
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Gunjan (0)

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If a signal f (t) has energy E, the energy E, the energy of the signal f (2t) is equal to

a) E

b) E/2

c) 2E

d) 4E
    
[Post New] 27 Mar 2009 10:21:51 IST
   Subject: If a signal f (t) has energy E, the energy E, the energy of the signal f (2t) is equal to
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Deepti (34)

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Its b.) E/2 because E=?|f(t)| 2 dtFor f(2t) energy=?|f(2t)|2 dt Let 2t=xt=x/2 dt=dx/2so E(f(2t)) =?|f(x)| 2 dx/4=E/4
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