Which of the following circumstances would prohibit a radio telescope from detecting a star?
a. cloud filled night sky
b. daytime
c. no visible light radiated
d. no radio waves radiated

 The correct answer is :  D. no radio waves radiated

Explanation:   The radio telescope works by picking up radio waves that are emitted by radio sources. In order to receive quality signals it is necessary to use antennas or groups of smaller antennas organized in parallel. Several stars emit radio waves and not visible light.

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a) which ethnic groups live in this community?

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