The 21-Centimeter Line Is One of the Most Important Wavelengths

question 29

Multiple Choice

The 21-centimeter line is one of the most important wavelengths in radio astronomy.Its relatively long wavelength is important because long wavelengths

• A) are more likely to interact with clouds of gas and dust.
• B) are more likely to pass through clouds of gas and dust.
• C) carry more information than short wavelengths of the same energy.
• D) can be detected with greater resolution than short wavelengths.

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Marketing activities designed to stimulate demand and sales of a product among retailers and distributors.

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The difference between the cost of a product or service and its selling price, expressed as a percentage of the cost, used to cover expenses and generate profit.

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