The electron structures of atoms are not involved in the emission of: a. gamma rays b. photoelectrons c. x-rays d. spectral lines

When a bicycle coasts uphill, it moves slower and slower as it climbs. why? a. its kinetic energy is transforming into heat energy. b. its potential energy is transforming into kinetic energy. c. its kinetic energy is transforming into potential energy and heat energy. d. its potential energy is transforming into kinetic energy and heat energy.

This is the number of complete movements of a wave per second.

The force needed to overcome static friction is usually less than that needed to overcome kinetic friction.true or false?