TS EAMCET Medical 8 May 2019 Shift 2 Paper

Question : 120 of 159

Marks: +1, -0

Identify the collect statement among the following.

AM detection is earned out using a rectifier and an envelope detector.
Amplitude modulated signal contains frequencies (ωc−ωm) and (ωc+ωm) only, (ωc and ωm are frequencies of carrier and modulating signal)
High frequency signals can not be transmitted to long distances.
Long distance communication between two points on the Earth is achieved through reflection of electromagnetic waves by Troposphere and Stratosphere

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