When a Radio Telescope Observes a Region of Space Between

question 5

Multiple Choice

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

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