Helium condenses into the liquid phase at approximately 4 K. What temperature, in degrees Fahrenheit, does this correspond to?
a. ?182
b. ?269
c. ?118
d. ?452
e. ?484
d
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You are standing near a railroad track and a train is moving toward you at 60 mph and blowing its horn. What will you notice as the train moves past you?
a. As the train approaches, the horn will sound lower in pitch than when the train is moving away. b. As the train approaches, the horn will sound higher in pitch than when the train is moving away. c. There will be no change in the pitch of the horn as it moves by. d. The horn will get louder as the train moves away from you. e. The horn will get quieter as the train moves toward you.
An excited atom is an atom
A) with excess vibration. B) with one or more displaced electrons. C) with more protons than electrons. D) that is frantic.
A slit of width 2.0 ?m is used in a single slit experiment with light of wavelength 650 nm. If the intensity at the central maximum is I0, what is the intensity 10° from the center?
A) 0.50I0 B) 0.35I0 C) 0.030I0 D) 0.53I0 E) 0.43I0
An alpha particle (m = 6.7 × 10^-27 kg, q = +3.2 × 10^-19 C) has a speed of 20 km/s at point A and moves to point B where it momentarily stops. Only electric forces act on the particle during this motion. Determine the electric potential difference VA - VB
a. +4.2 V b. -4.2 V c. -9.4 V d. +9.4 V e. -8.4 V