For a certain metal, light of frequency 7.24 × 10-14 Hz is just barely able to dislodge photoelectrons from the metal. (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J, e = 1.60 × 10-19 C)
(a) What will be the stopping potential if light of frequency 8.75 × 10-14 Hz is shone on the metal?
(b) What is the work function (in electron-volts) of this metal?
(a) 0.625 V (b) 3.00 eV
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The eccentricity of a planet's orbit describes
a. westward motion in the night sky when observed on successive nights. b. the deviation in shape when compared to a circle. c. its tilt with respect to the ecliptic plane. d. the tilt of the planet's rotational axis with respect to the ecliptic.
Suppose you see two main-sequence stars of the same spectral type. Star 1 is dimmer in apparent brightness than Star 2 by a factor of 100. What can you conclude? (Neglect any effects that might be caused by interstellar dust and gas.)
A) Without first knowing the distances to these stars, you cannot draw any conclusions about how their true luminosities compare to each other. B) The luminosity of Star 1 is a factor of 100 less than the luminosity of Star 2. C) Star 1 is 100 times more distant than Star 2. D) Star 1 is 100 times nearer than Star 2. E) Star 1 is 10 times more distant than Star 2.
From the following statements regarding the ratio of the molar specific heat at constant pressure to the molar specific heat at constant volume, Cp/Cv, the only correct one for an ideal monatomic gas is
A) = 1. B) > 1. C) < 1. D) Cp/Cv is sometimes more than 1, sometimes less than 1, but never equal to 1. E) Cp/Cv is sometimes more than 1, sometimes equal to 1, but never less than 1.
Does this experiment confirm the validity of the parallel resistor equation used in Procedures 5(f) and 6(f)?