What frequency must a photon have to raise an electron in a hydrogen atom from the n = 2 to the n = 4 state? (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A) 3.06 × 1014 Hz
B) 6.16 × 1014 Hz
C) 4.11 × 1014 Hz
D) 5.20 × 1014 Hz
E) 9.24 × 1014 Hz
B
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The specific of ice is 2.10 kJ/kg
the heat of fusion for ice at 0
is 333.7 kJ/kg, the specific heat of water 4.186 kJ/kg
and the heat of vaporization of water at 100
is 2,256 kJ/kg. What is the final equilibrium temperature when 5.00 grams of ice at -15.0
is mixed with 40.0 grams of water at 75.0
?
A. 30.1
B. 28.3
C. 20.9
D. 18.6
E. 16.1
Four of the five answers listed below apply to conditions where energy is released. Select the exception
a. endergonic reaction b. respiration c. entropy d. second law of thermodynamics e. exergonic reaction
Which of the following is not a real difference between asteroids and comets?
A) Asteroids orbit the Sun while comets just float randomly around in the Oort cloud. B) Most asteroids are located much nearer to the Sun than most comets. C) It is thought that comets are far more numerous than asteroids. D) Asteroids are made mostly of rock and comets are made mostly of ice.
If we double the resistance in a circuit but keep the current in it constant, the power dissipated by that circuit will
A) be four times as great. B) be two times as great. C) be one-half as great. D) be one-fourth as great.