When a radio telescope observes a region of space between two stars, it detects electromagnetic radiation that has a wavelength of 0.21 m. This radiation was emitted by hydrogen atoms in the gas and dust located in that region. What is the frequency of this radiation?
A) 7.1 × 1010 Hz
B) 2.1 × 1014 Hz
C) 3.0 × 108 Hz
D) 6.9 × 1011 Hz
E) 1.4 × 109 Hz
Correct Answer:
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