If the hypothesis tracing the extinction of the dinosaurs to an impact is correct, the dinosaurs died off largely because
A) of global climate effects initiated by dust and smoke that entered the atmosphere after the impact.
B) of injuries suffered from direct hits of pieces of the asteroid or comet.
C) radiation from iridium in the asteroid caused the dinosaurs to die of cancer.
D) the impact caused massive earthquakes worldwide.
A) of global climate effects initiated by dust and smoke that entered the atmosphere after the impact.
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Materials in which the electrons are bound very tightly to the nuclei are referred to as
A) insulators. B) conductors. C) semiconductors. D) superconductors. E) polar.
Exhibit 17-3Four wave functions are given below. I.y(x, t) = 5sin(4x- 20t + 4) II.y(x, t) = 5sin(3x- 12t + 5) III.y(x, t) = 5cos(4x + 24t + 6) IV.y(x, t) = 14cos(2x- 8t + 3)Use this exhibit to answer the following question(s). Refer to Exhibit 17-3. Rank the wave functions in order of the magnitude of the wave speeds, from least to greatest.
A. IV, II, I, III B. IV = II, I, III C. III, I, II, IV D. IV, I, II, III E. III, IV, II, I
An electron moving in the positive x direction experiences a magnetic force in the positive z direction. If Bx = 0, what is the direction of the magnetic field?
a. negative y direction b. positive y direction c. negative z direction d. positive z direction e. negative x direction
An object strongly reflects red light, but readily absorbs all other colors of light. Relative to the number of thermal photons of red light emitted by a black body at the same temperature T, our object’s thermal emission rate of photons of red light will be
A. enhanced. B. Suppressed. C. unchanged. D. The answer depends on the value of T.