The characteristic peaks in an x ray spectrum of an atom occur because
a. of photon absorption
b. of the photoelectric effect
c. electrons in the atom make transitions to lower energy levels
d. of the uncertainty principle
e. of rapid deceleration of the bombarding electrons
C
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Raul is attending a workshop, but he is having difficulty hearing the speaker because the people behind him are talking. What type of barrier to effective listening is Raul experiencing?
a. Psychological barrier b. Nonverbal distraction c. Grandstanding d. Physical barrier
To the nearest percent, what fraction of an iceberg is submerged? (?ice = 917 kg/m3, ?sea = 1.03 × 103 kg/m3.)
A. 95% B. 93% C. 91% D. 89% E. 77%
Many supernovas are thought to result in
A) neutron stars. B) regular stars like our sun. C) red giant stars. D) white dwarfs.
A small sphere attached to a light rigid rod rotates about an axis perpendicular to and fixed to the other end of the rod. Relative to the positive direction of the axis of rotation, the angular positions of the sphere are negative, its angular velocity is negative, and its angular acceleration is negative. The sphere is
a. rotating clockwise and slowing down. b. rotating counterclockwise and slowing down. c. rotating clockwise and speeding up. d. rotating counterclockwise and speeding up. e. first rotating counterclockwise and then clockwise.