Electrons are accelerated through a potential difference of 15kV. The electrons collide with a metal target and a spectrum of X-rays is produced.
(i) Explain why a continuous spectrum of energies of X-ray photons is produced.

The sun generates both mechanical and electromagnetic waves. which statement about those wave is true?

Acar of mass m goes around a banked curve of radius r with speed v. if the road is frictionless due to ice, the car can still negotiate the curve if the horizontal component of the normal force on the car from the road is equal in magnitude to 101) a) mv2/r b) mg/2. d) mg e) tan[v2/(eg)]

Which of the following harmful chemicals are found in tobacco smoke? a. carbon monoxide b. carbon dioxide c. nicotine b. carbon dioxide d. both a and c