A 30 W bulb is used for one hour. If it produces 56000 J of light energy, what is the bulb’s efficiency?

Which of the following correctly describes what happens when an atomic bomb explodes? small pieces of fissionable material are joined and form a body with a mass greater than the critical mass, the relative number of neutrons escaping decreases, and a chain reaction and explosion result. large pieces of fissionable matter are brought together quickly and form a body with a mass smaller than the critical mass, the relative number of escaping neutrons increases, and a chain reaction and explosion result.

Acertain radio station broadcasts radio waves that have a wavelength of 298cm what is its broadcast frequency?

The earth exerts a gravitational force of 500 n on amy. what is amy’s mass in kg?