A laser produces 20.0 mW of red light. In 1 hour, the laser emits 2.29 X 10^20 photons. What is the wavelength of the laser?

A small metal sphere has a mass of 0.14 g and a charge of - 22.0 nc. it is 10 cm directly above an identical sphere with the same charge. this lower sphere is fixed and cannot move.

If the net force upon on object is zero, can it have a non-zero accerleration?

A force can be a push or a pull that, if unbalanced, can cause a change in an object's motion. a. true b. false

Two manned satellites approaching one another at a relative speed of 0.450 m/s intend to dock. The first has a mass of 4.50 ✕ 103 kg, and the second a mass of 7.50 ✕ 103 kg.

The minimum energy needed to eject an electron from a sodium atom is 4.41 x 10-19 j. what is the maximum wavelength of light, in nanometers, that will show a photoelectric effect with sodium?

A large metallic sphere insulated from ground is charged with an electrostatic generator while a person standing on an insulating stool holds the sphere. why is it safe to do this?

What is the tense In sailed

Acceleration is a vector quantity. O O A. True B. False

What will happen to the brightness of a string of bulbs hooked up in series when you increase the number of bulbs in the string? A. Each light in the string will get brighter. B. Each light in the string will get dimmer. C.

What are the two factors that influence the composition of beach material