What is the energy of an incident photon that is just enough to excite a hydrogen atom from its ground state to its n = 4 state?
A) 12.75 eV
B) 10.20 eV
C) 3.40 eV
D) 0.85 eV
Answer: A
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Pulsars slow their pulse rate because:
a. they convert energy of rotation into radiation. b. they drag companion stars around, causing them to slow. c. of friction with the interstellar medium. d. of the conservation of angular momentum.
Why is Venusian lava less viscous than Earth's?
A. There is more water in Earth's lava. B. Earth's rapid rotation stirs its lava, making it thinner. C. Earth's surface has a lower temperature. D. Atmospheric pressure on Venus is much higher than on Earth.
The surface of the Sun is at approximately 5 700 K and the temperature of the Earth's surface is about 290 K. What total entropy change occurs when 1 175 J of heat energy is transferred from the Sun to the Earth?
a. 4.05 J/K b. 3.85 J/K c. 0.206 J/K d. 4.26 J/K e. 6.05 J/K
Two baseballs are released at the same time. One is dropped from rest and the other is given an initial horizontal velocity. Which of the following is not true? Ignore atmospheric drag
a. Both baseballs hit the ground at the same time. b. Both have the same vertical component of velocity as they reach impact. c. The horizontal component of velocity increases at a greater rate than the vertical component of velocity for both while they are both in the air. d. The horizontally-released ball has a greater speed than the other ball for the whole trip.