To study the energy of photoelectrons we measure
A) the potential difference required to stop them.
B) the distance traveled in a given time.
C) the time taken to travel a given distance.
D) their temperature.
Answer: A
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What is the magnitude of the magnetic force on a charged particle (Q = 5.0 ?C) moving with a speed of 80 km/s in the positive x direction at a point where Bx = 5.0 T, By = ?4.0 T, and Bz = 3.0 T?
a. 2.8 N b. 1.6 N c. 1.2 N d. 2.0 N e. 0.4 N
Which of the following is a feature of quantum physics that is not valid according to Newtonian physics?
A) The second law of thermodynamics. B) The universe is made of tiny particles. C) The future is entirely determined by the present. D) The principle of conservation of energy. E) Nature is non-local, i.e., separated objects are sometimes instantaneously connected with each other.
Which of the following best describes a substance in which the temperature remains constant while at the same time it is experiencing an inward heat flow?
a. gas b. liquid c. solid d. substance undergoing a change of state
The optical shape of segmented mirrors is controlled by computer-driven thrusters under the mirrors in what is called
a. an achromatic lens. b. active optics. c. a Schmidt-Cassegrain design. d. a Newtonian design. e. interferometry.