Planck's quantum theory is compatible with the experimental data related to which of the following?
a. blackbody radiation
b. the photoelectric effect
c. line spectra emitted by hydrogen gas
d. all of the above
d
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Which of the following best describes the lunar maria?
A) relatively smooth, flat plains on the Moon B) densely cratered regions on the Moon C) mountainous regions on the Moon D) frozen oceans of liquid water on the Moon
The interstate on-ramp is 5.5 km West of your home, and on leaving for grandmother’s house you are only able to accomplish an average velocity of 38 km/hr between your home and the on-ramp. At the on- ramp, you wait for traffic, for 2.0 min – and then are able to proceed toward grandmother’s house. If you wish to arrive there, which is 15 km South of the on-ramp, over a river and through some woods, having achieved an average velocity of 42 km/hr, how fast do you need to drive south on the interstate highway?
A. 58 km/hr B. 48 km/hr C. 78 km/hr D. 39 km/hr
A cylindrical capacitor is made of two thin-walled concentric cylinders. The inner cylinder has radius r1 = 4.0 mm, and the outer one a radius r2 = 8.0 mm. The common length of the cylinders is L = 150 m
What is the potential energy stored in this capacitor when a potential difference 4.0 V is applied between the inner and outer cylinder? (k = 1/4??0 = 8.99 × 109 N • m2/C2) A) 9.6 × 10-8 J B) 1.3 × 10-8 J C) 6.3 × 10-8 J D) 0.34 × 10-8 J E) 4.6 × 10-8 J
Gamma rays can penetrate
A) air only. B) a piece of paper. C) several millimeters of aluminum. D) several centimeters of lead. E) several meters of iron.