Question

the images below show a radio telescope and an optical telescope.

radio telescopes detect sources of radio waves, such as galaxies and stars. since these sources are very far away, radio telescopes need large antennae with a round dish to help collect the waves. optical telescopes gather and focus visible light waves. they use glass lenses and mirrors to increase the brightness of light produced by or reflected from distant objects, such as stars and planets.

what do these two types of telescopes indicate?

a. every object in the universe produces all wavelengths in the electromagnetic spectrum.
b. telescopes are always needed to detect the visible light waves and radio waves from objects in the universe.
c. radio waves and visible light waves are created by all objects in the universe.
d. different wavelengths of the electromagnetic spectrum can be used to study the universe.

Explanation:

Analyze the function of each telescope

The text states that radio telescopes detect radio waves from distant sources like galaxies and stars, while optical telescopes gather and focus visible light waves from stars and planets. Both radio waves and visible light are different regions of the electromagnetic spectrum.

Evaluate the options based on scientific principles

• Option A claims every object produces all wavelengths. This is incorrect because objects emit specific wavelengths depending on their temperature and composition, not all wavelengths.
• Option B claims telescopes are always needed to detect visible light and radio waves. This is incorrect because some visible light can be seen with the naked eye, and some radio signals can be detected by simpler antennas.
• Option C claims radio waves and visible light are created by all objects. This is incorrect as not all objects emit both types of radiation.
• Option D states that different wavelengths of the electromagnetic spectrum can be used to study the universe. This is correct because using both radio waves and visible light allows astronomers to gather different types of information about celestial objects.

Answer:

• (A) Every object in the universe produces all wavelengths in the electromagnetic spectrum.
• (B) Telescopes are always needed to detect the visible light waves and radio waves from objects in the universe.
• (C) Radio waves and visible light waves are created by all objects in the universe.
• (D) Different wavelengths of the electromagnetic spectrum can be used to study the universe. (Correct answer)