Which statement accurately describes radiation?

Radiation needs matter to transfer thermal energy.

Thermal energy is transferred by electromagnetic waves.

Ironing a shirt to take out wrinkles is an example of radiation.

Which excited electron has the lowest energy?

The formula for distance divided by time

When you decrease the length of the effort arm on a lever which of the following happens to effort force? A. Force will decrease B. Force will increase C. Force will vary D. Force will remain the same.

When energy changes from one form to another, some energy is always changed to A. sound B. heat C. electricity D. light.

Which of the following best describes internal energy

What process is used when the sun transfers light to plants A. conduction B. radiation C. convection D. all of these

Which wave characteristic has the unit hertz

A stretched spring has 5184 J of elastic potential energy and a spring constant of 16,200 N/m. What is the displacement of the spring?

A block of mass 1.3 kg is resting at the base of a frictionless ramp. A bullet of mass 50 g is traveling parallel to the ramp surface at 250 m/s. It collides with the block, enters it, and exits the other side at 100 m/s.

Metals are good thermal conductors - that is, when there is a temperature difference across their ends, they transfer energy very efficiently from the higher temperature end to the lower temperature end.