In 1921, Stern and Gerlach performed an experiment that first demonstrated
a. orbital angular momentum quantization
b. energy quantization
c. space quantization
d. magnetic orbital quantization
e. that particles behave like waves
c
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How long does light take to reach us from Proxima Centuri?
a. 4.2 ly b. 4.2 years c. 8.4 AU d. 8.4 km
A filtergram is a photograph of the Sun's surface made
a. in a band of wavelengths in the infrared. b. in a band of wavelengths in the ultraviolet. c. using the Zeeman effect. d. with only those photons emitted in a specific spectral line. e. none of the others.
Exclusion Principle: Neon has 10 electrons. What is the value of Z of the next higher element that has chemical properties very similar to those of neon?
A. 11 B. 17 C. 18 D. 19 E. 36
Case 1: An electron is released from rest in a uniform electric field. Case 2: A proton is released from rest in a uniform electric field of the same magnitude as in case 1 . How does the electric potential energy of the charge-field system behave in these cases?
a. In case 1 the potential energy increases, but in case 2 it decreases. b. In both cases, the potential energy increases. c. In case 1 the potential energy decreases, but in case 2 it increases. d. In both cases, the potential energy decreases.