Estimate the speed of a galaxy that is 10 billion light-years away
A)
0.1c
B)
0.3c
C)
0.5c
D)
0.7c
E)
0.9c
D
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At night an underwater scuba diver aims a flashlight beam toward the surface at 15° to the normal. Upon emerging into the air, the beam angle will be
A) less than 15°. B) 15°. C) more than 15°. D) impossible to predict.
Which of the following statements is true?
A) In a p-type doped semiconductor the donor level is close to the valence band. B) In an n-type doped semiconductor the acceptor level is close to the valence band. C) In a p-type doped semiconductor the acceptor level is close to the valence band. D) In an n-type doped semiconductor the donor level is close to the valence band. E) None of the statements are true.
Matter Waves: Electrons with a speed of 2.1 × 106 m/s are directed towards a 1.0-?m wide slit. An electron detector is placed 1.0 m behind the slit. How wide is the central maximum of the electron diffraction pattern on the detector? (h = 6.626 × 10-34 J ? s, melectron = 9.11 × 10-31 kg)
A. 690 ?m B. 350 ?m C. 1000 ?m D. 1400 ?m
A string with a fixed frequency vibrator at one end is subjected to varying tensions. When the tension is 20 N, a resonance with 3 antinodes results. What tension would cause a resonance with 2 antinodes in this string?
a. 30 N b. 45 N c. 80 N d. 8.9 N e. 13 N