Light enters a substance from air at 30.0° to the normal. It continues through the substance at 23.0° to the normal. What would be the critical angle for this substance?
A)
53.0°
B)
51.4°
C)
36.7°
D)
23.8°
E)
12.6°
B
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The actual depth of a shallow pool 1.00 m deep is not the same as the apparent depth seen when you look straight down at the pool from above. How deep (in cm) will it appear to be? (nwater = 1.33.)
A. 133 B. 75.2 C. 90.6 D. 117 E. 100
Consider an atom of gold in which the nucleus contains 79 protons and 118 neutrons. What is its atomic number and atomic mass number?
A) The atomic number is 118, and the atomic mass number is 79. B) The atomic number is 118, and the atomic mass number is 197. C) The atomic number is 79, and the atomic mass number is 197. D) The atomic number is 79, and the atomic mass number is 118.
An alpha particle (m = 6.7 × 10^?27 kg, q = +3.2 × 10^?19 C) has a speed of 20 km/s at point A and moves to point B where it momentarily stops. Only electric forces act on the particle during this motion. Determine the electric potential difference VA ? VB
a. +4.2 V b. ?4.2 V c. ?9.4 V d. +9.4 V e. ?8.4 V
On planet X, the pressure at a depth of 2.00 m below the surface of a liquid nitrogen lake is 5.00 × 105 N/m2
At a depth 5.00 m below the surface, the pressure is 8.00 × 105 N/m2. The density of liquid nitrogen is 808 kg/m3. (a) What is the atmospheric pressure at the surface of the lake? (b) What is the acceleration of gravity on planet X?