When a radio telescope observes a region of space between twostars, it detects e

Question

When a radio telescope observes a region of space between twostars, it detects electromagnetic radiation that has a wavelengthof 0.21 m. This radiation was emitted by hydrogen atoms in the gasand dust located in that region. What is the frequency of thisradiation?

a. 1.4 × 109Hz
b. 7.1 × 1010Hz
c. 6.9 × 1011Hz
d. 3.0 × 108Hz
e. 2.1 × 1014 Hz When a radio telescope observes a region of space between twostars, it detects electromagnetic radiation that has a wavelengthof 0.21 m. This radiation was emitted by hydrogen atoms in the gasand dust located in that region. What is the frequency of thisradiation? 1.4 × 109Hz 7.1 × 1010Hz 6.9 × 1011Hz 3.0 × 108Hz 2.1 × 1014 Hz

Explanation / Answer

Use the formula = v / f Rewritten:      f = v / Where is the wavelength, f is the frequency and v is thespeed of the wave. The speed of light is 3.0 x 108 m/s The wavelength is 0.21 m So... f = (3.0 x 108) / 0.21 = 1.4 x 109 Hz

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