I want to examine the surface of a planet that is covered by a thick atmosphere (which includes oxygen and contains a very thick layer of water clouds that never clears). What wavelength of electromagnetic radiation would I be smartest to use:
A) visible light
B) x-rays
C) radar waves
D) ultra-violet
E) none would work

Question

Quizplus · Accepted Answer

Since the planet is covered by a thick layer of water clouds that never clears, visible light and ultra-violet radiation would be scattered and absorbed, making it impossible to examine the planet's surface using those wavelengths. X-rays would also be absorbed by the atmosphere. However, radio waves like radar can penetrate through the clouds and bounce back off the surface, allowing us to gather information about the planet's surface features. Thus, the smartest wavelength to use would be radar waves.

I Want to Examine the Surface of a Planet That