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Power spectral density of thermal noise remains uniform upto frequency ___________

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Power spectral density of thermal noise remains uniform upto frequency ___________

(a) 10^15 HZ

(b) 10^5 HZ

(c) 10^2 HZ

(d) 10^13 HZ

I had been asked this question in an internship interview.

This key question is from Carrier Acquistion Techniques in DSB-SC topic in chapter Double Sideband Suppressed Carrier Modulation of Analog Communications

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The correct answer is (d) 10^13 HZ

Explanation: Power Spectral Density is the quantity of power present in a signal in the frequency domain. Power spectral density of thermal or white noise gets affected when the frequency becomes greater than 10^13 Hz and thus, it remains uniform upto 10^13 Hz.

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