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

Physics & Space Science

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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.)

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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

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Consider an atom of gold in which the nucleus contains 79 protons and 118 neutrons. What is its atomic number and atomic mass number?

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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

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