Given a scientific question, generate a correct answer to it.

Ex Input:
What do you call a device that produces a very focused beam of visible light of just one wavelength and color?

Ex Output:
laser

Ex Input:
What equals the mass of the object (in kilograms) times the acceleration due to gravity (9.8 m/s 2 )?

Ex Output:
weight

Ex Input:
What are electromagnetic waves with the longest wavelengths called?

Ex Output:
radio waves