Radio astronomers often study the radiation emitted by a hydrogen atom from a transition between the two hyperfine levels associated with the ground state. This radiation has a wavelength of 21 cm
What is the energy difference between the hyperfine levels? (1 eV = 1.60 × 10-19 J) A) 5.9 × 10-6 eV
B) 5.9 × 10-25 J
C) 1.7 × 10-24 J
D) 4.7 × 10-25 J
A
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When an unstable nucleus decays by emitting an alpha particle, the atomic mass number A of the nucleus
A) increases by 4. B) increases by 2. C) decreases by 2. D) decreases by 4. E) remains unchanged.
A high tide is occurring at Charleston, South Carolina (80°W, 33°N). At approximately what other longitude is a high tide occurring?
a. 100°E b. 80°E c. 60°E d. 40°E e. 20°E
An object that is accelerating will always
have a) a changing velocity. b) a decreasing velocity. c) an increasing velocity. d) a constant speed but a changing direction.
Which of the following states is not possible for n = 4?
1.4h 2.4f 3.4d 4.4s