In the ground state, the quantum numbers (n, ?, m?, ms) for hydrogen are, respectively,
A)
1, 1, 1, 1.
B)
1, 0, 0, 0.
C)
1, 0, 0, ±1/2.
D)
1, 1, 1, ±1/2.
E)
1, 1, 0, ±1/2.
C
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A 2.0-kg mass is projected vertically upward from ground level with an initial speed of 30 m/s. The mass rises to a maximum height of 35 m above ground level. What is the change in mechanical energy of the mass caused by air resistance between the point of projection and the point of maximum height?
A. ?0.21 kJ B. ?0.47 kJ C. ?0.40 kJ D. ?0.34 kJ E. ?0.69 kJ
The continuous part of an x-ray spectrum of an atom occurs because
a. of photon absorption. b. of the photoelectric effect. c. electrons in the atom make transitions to lower energy levels. d. of the uncertainty principle. e. of rapid deceleration of the bombarding electrons.
An object is hung using a metal spring. If now a current is passed through the spring, what will happen to this system?
A) The spring will begin to swing like a pendulum. B) The spring will extend, lowering the weight. C) The spring will contract, raising the weight. D) The weight will not move. E) None of these are true.
Temperature Scales: What is absolute zero on the (a) Celsius scale and (b) on the Fahrenheit scale?
What will be an ideal response?