A photocathode whose work function is 2.5 eV is illuminated with white light that has a continuous wavelength band from 360 nm to 700 nm. The stopping potential for this white light illumination is closest to:
A) 0.94 V
B) 0.85 V
C) 1.0 V
D) 1.1 V
E) 1.2 V
A
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If you were to cut a small permanent bar magnet in half,
A) neither piece would be magnetic. B) one piece would be a magnetic north pole and the other piece would be a south pole. C) each piece would in itself be a smaller bar magnet with both north and south poles. D) None of these statements is true.
A 3.00-kg stone is dropped from a 39.2 m high building. When the stone has fallen 19.6 m, the magnitude of the impulse it has received from the gravitational force is
a. 9.80 N s. b. 19.6 N s. c. 29.4 N s. d. 58.8 N s. e. 118 N s.
What is the complementarity principle?
a. If an electron or photon is a particle, it cannot be a wave. b. If an electron is being observed as a particle, it cannot be simultaneously observed as a wave. c. A complete description of an electron or photon must include its particle and wave characteristics. d. If electrons act as particles in an experiment, then the photons in the experiment behave as waves. e. When an electron or photon is behaving like a particle, it is not behaving like a wave.
Most of the waves in the electromagnetic spectrum are
A) red light. B) blue light. C) green light. D) invisible.