Based on what you learned about radio telescopes, select all of the correct stat

Question

Based on what you learned about radio telescopes, select all of the correct statements from the following list.

Radio telescopes usually make observations of very large regions of the sky.

The large size of radio telescopes make interferometery unnecessary. Radio telescopes are used to detect cool hydrogen.

Radio telescopes have to be larger than optical telescopes, since radio waves are longer than visible light waves.

Since radio telescopes are so large, they have much better resolution than optical telescopes.

Radio waves can travel through obstacles that block out waves of visible light.

All objects emit visible light, so radio wavelengths just provide another way to look at them.

Explanation / Answer

The true statements are:

Radio telescopes are larger than optical telescopes because the wavelength of radiowaves is much larger than visible region wavelengths.

Radio waves can travel through obstacles that block out visible light.

Incorrect statements are:

The large size of radio telescopes make interferometery unnecessary. Radio telescopes are used to detect cool hydrogen.

this is incorrect because some radio telescopes use interferometric techniques for obtaining phase information.

Since radio telescopes are so large, they have much better resolution than optical telescopes.

this is incorrect because radio telescopes have to be as large as they are to reach the resolution of optical telescopes (owing to the large wavelength of radiowaves).

All objects emit visible light, so radio wavelengths just provide another way to look at them.

this is incorrect because many invisible gases are studied using radio telescopes which is not otherwise possible [since the gases do not emit any light in visible region].

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