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

As you may know that telescopes abosrb light, amplify it and make it available for analysis, they are classified on the basis of the wavelength of light they absorb.

Radio telescopes are designed for detecting radio-frequency radiation(wavelengths of about 10 metres (30 megahertz [MHz]) and 1 mm (300 gigahertz [GHz])) emitted by extraterrestrial sources, such as stars and galaxies. These originally have low resolution ad many design and technical considerations are put to get them a similar resolutions as optical telescopes.

Let us fo through the list one by one.

Radio telescopes are used for studying the universe as they emit lare radio waves studying which can help in understanding different phenomenons not possible to study through visible light. Radio telescopes are very important for undrestanding the sky and the universe

The resolution achieved by a typical radio telescope at typical radio wavelengths is not very detailed ( not even close to optical telescope). To overcome this difficulty, radio astronomers use multiple radio telescopes at the same time, i.e. interferometry. Hence, it is required for a detailed view.

Hydrogen atoms are the most common type of atoms in the universe and much of the hydrogen gas is too far away from any star to produce emission in the optical wavelength band and be visible through optical telescopes. In addition, there are cold clouds made of over a hundred different types of molecules including organic molecules. Stars and planetary systems form in these molecular clouds. Here, radio telescopes become vital as they detect the emission from cool clouds of hydrogen in the space between the stars helping in understanding the universe.

As mentioned above, radio waves are very long as compared to visible light and also cosmic radio sources are extremely weak. To accomodate this wavelength and get a good resolution, radio telescopes are the largest telescopes in the world with the most sensitive radio receivers are used inside them.

Since, radio telescopes abosrb higher wavelength, it is characterised by lower energy than the optical waves. A smaller size won't get a good resolution so a larger size is necessary for getting a similar resolution like optical telescopes.

Since, The radio waves have very large wavelengths, they ignore the obstacles because they're too thin as compared to their size. Radio signals pass straight through the clouds and can be detected by the large antennas used in them.

Radio waves help in observing those objects which cannot be observed through visible light, such as cloud of gases. It is not just another way of looking at the sky but looking at a broader spectrum which can even pass through all the obstacles and getting a detailed view of the universe. Every part of spctrum comes with its own advantage of studying a certain kind of object, hence radio waves have diffeent advantages than visible light.

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