Question

1. which of the following are earth - based telescopes?

• infrared telescopes and gamma ray telescopes
• ultraviolet telescopes and x - ray telescopes
• optical telescopes and radio telescopes
• ultraviolet telescopes and infrared telescopes

Explanation:

Most high-energy wavelengths like gamma-ray, X-ray, and most ultraviolet/infrared are absorbed by Earth's atmosphere, making ground-based observation impossible. Optical (visible light) and radio wavelengths pass through the atmosphere, so their telescopes are Earth-based.

Answer:

optical telescopes and radio telescopes