Which one of these has kinetic energy? A. book on the table
B. rock on top of a hill
C. a stationary car
D. A moving train

A100-watt light bulb radiates energy at a rate of 100 j/s. (the watt, a unit of power or energy over time, is defined as 1 j/s.) if all of the light emitted has a wavelength of 525 nm , how many photons are emitted per second?

Which of the following electromagnetic waves can create ions?

What is the molar mass of a gas that has density of 2.054 g/l