What determines how many electrons will leave a piece of metal in the photoelectric effect

Which term means the weight of air measured in units of force per area? A. air pressure B. air viscosity C. relative pressure D. air resistance

Which of the following is not part of the role of a forester

Which of the following is true? A. The Earth and Moon both exert a gravitational force on each other. B. The Moon exerts a gravitational force on the Earth, but the Earth does not exert a gravitational force on the Moon. C.

How does seismic waves cause earthquakes?

During a lunar eclipse, during which phase of the moon can a lunar eclipse occur?

For a vacation, you and your family fly east to west from Boston, Massachusetts, to Seattle, Washington. You notice that your flight back home to Boston is shorter than your flight to Seattle. Which phenomenon causes your flight home to be shorter?

You spy on an anchor on the bottom of a lake. What is the direction and amount of force the water exerts on it: a) zero b) up, equal to the weight of the anchor. c) up, less than the weight of the anchor d) down, equal to the weight of the anchor.

How are electromagnetic waves different from matter waves?

A dc generator is the same as a (n) a. electric motor. b. ac generator. c. armature. d. electric current.

Which of the following best describes scientific knowledge A.) Durable B.) Absolute and never changing C.) Frequently varies