The lowest energy level in an atom is
a. the absolute zero temperature.
b. the ground state.
c. the ionization level.
d. responsible for Doppler shifts.
e. the energy level from which the Paschen series of hydrogen originates.
b
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Does Venus’s surface experience meteorite impacts today? How do you know?
a. Yes. This is confirmed by Venus’s atmospheric composition, especially the abundance of deuterium. b. Not many. Since the atmosphere of Venus is very thick, most meteorites cannot reach the surface of Venus. c. No. Since Venus does not have a magnetic field, it does not attract meteoroids onto its surface. d. Yes. Meteorites fall onto Venus’s surface often because of the planet’s slow retrograde rotation and absence of moons.
Two tuning forks with frequencies 264 and 262 Hz produce "beats". What is the beat frequency (in Hz)?
A. 4 B. 2 C. 1 D. 3 E. 0 (no beats are produced)
Five moles of an ideal gas expands isothermally at 100°C to five times its initial volume. Find the heat flow into the system.
A. 2.5 × 104 J B. 1.1 × 104 J C. 6.7 × 103 J D. 2.9 × 103 J E. 7.0 × 102 J
Three charged particles are positioned in the xy plane: a 50-nC charge at y = 6 m on the y axis, a ?80-nC charge at x = ?4 m on the x axis, and a 70-nc charge at y = ?6 m on the y axis. What is the electric potential (relative to a zero at infinity) at the point x = 8 m on the x axis?
a. +81 V b. +48 V c. +5.8 V d. ?72 V e. ?18 V