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If a periodic signal is decomposed into five sine waves with frequencies of 100, 300, 500, 700, and 900 Hz, what is its bandwidth?

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If a periodic signal is decomposed into five sine waves with frequencies of 100, 300, 500, 700, and 900 Hz, what is its bandwidth?

(a) 2500 Hz

(b) 900 Hz

(c) 800 Hz

(d) can’t be determined with the information given

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I'd like to ask this question from Layers topic in chapter Cryptography Overview, TCP/IP and Communication Networks of Cryptograph & Network Security

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Right answer is (c) 800 Hz

Best explanation: The bandwidth is 900-100 = 800 Hz.

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