Which one of the following environments will sound not travel through?

A. Vacuum

B. Gas

C. Solid

D. Liquid

What order shows increasing frequency for gamma rays, microwaves, visible light, and X-rays?

If the lights are off in a room and there are no windows, why do most objects appear black?

Explain why atomic radius decreases as you move to the right across a period for main-group elements but not for transition elements. Match the words in the left column to the appropriate blanks in the sentences on the right.

Betty made a simple electromagnet using just a battery and a wire. What could Betty do to increase the strength of her electromagnet?

Organic compounds include

Technician A says Nylock nuts distort when tightened and, since the insert is nylon, they are re-useable. Technician B says self-locking nuts are very resistant to loosening from engine and vehicle vibrations.

Communicate the results

What is the function of the muscles around the lens in the human eye

How does planting trees in urban areas improve air quality and reduce energy use?

A student sitting in a merry-go-round has an acceleration of 3.6 m/s2. If the tangential velocity of the student is 2.5 m/s, what is the distance of the student from the center of the merry-go-round?