Rutherford's experiment, in which he fired alpha particles of 7.7 MeV kinetic energy at a thin gold foil, showed that nuclei were very much smaller than the size of an atom because
a. some alpha particles passed through the foil undeflected.
b. some alpha particles were deflected backwards.
c. some alpha particles were captured by the gold nuclei.
d. the alpha particles could not get closer than 10?10 m to the gold nuclei.
e. the alpha particles split into deuterium nuclei when they encountered the gold nuclei.
b
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All the following statements are true. Which one explains why mean solar time differs from apparent solar time?
A) The length of a solar day is not always exactly 24 hours. B) Earth's rotation period is actually about 23 hours and 56 minutes, not 24 hours. C) Earth's axis precesses with a period of about 26,000 years. D) The Sun reaches the meridian at different times at different longitudes within the same time zone.
That all points on a wave front act as new sources of spherical waves is attributed to:
a. Maxwell. b. Young. c. Thomas. d. Huygens.
Three materials with n1 < n2 < n3 are arranged in layers of uniform thickness. A light ray in air enters the first layer at an angle of incidence of 40° and the ray eventually exits the third layer at the refracted angle q in air. What is the value of q?
a. Some angle more than 40°. c. 40°. b. Insufficient information to answer. d. Some angle less than 40°.
In the figure, two wooden blocks each of 0.30 kg mass are connected by a string that passes over a very light frictionless pulley. One block slides on a horizontal table, while the other hangs suspended by the string, as shown in the figure
At time t = 0, the suspended block is 0.80 m over the floor, and the blocks are released from rest. After 2.5 s, the suspended block reaches the floor. What is the coefficient of kinetic friction between the table and the sliding block? A) 0.35 B) 0.52 C) 0.84 D) 0.65 E) 0.95