The average molecular translational kinetic energy of a molecule in an ideal gas is
A.
kBT.B.
RT.C.
kBT.D.
RT.E.
kBT, where n = number of internal degrees of freedom.Answer: A
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How was de Broglie's theory of the waviness of matter first confirmed?
A) By allowing two electrons to pass through each other. B) By passing an electron beam through a metal foil and observing the pattern of impacts on a screen. C) By careful microscopic investigation of individual electrons. D) By passing a neutron beam through a double-slit experiment and observing the pattern of impacts on a screen. E) By passing an electron beam through a single slit and observing the pattern of impacts on a screen.
Protostars are difficult to observe because
a. the protostar stage is very short.
b. they are surrounded by cocoons of gas and dust.
c. they radiate mainly in the infrared.
d. the protostar stage is very short, they are surrounded by cocoons of gas and dust, and they radiate mainly in the infrared.
e. they are all so far away that the light hasn't reached us yet.
An 800-kHz radio signal is detected at a point 2.7 km distant from a transmitter tower. The electric field amplitude of the signal at that point is 0.36 V/m
Assume that the signal power is radiated uniformly in all directions and that radio waves incident upon the ground are completely absorbed. What is the intensity of the radio signal at that point? (c = 3.00 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2) A) 170 µW/m2 B) 240 µW/m2 C) 340 µW/m2 D) 120 µW/m2 E) 86 µW/m2
The circuit below shows three resistors in series. R3 > R2 > R1. The resistors are all made of the same wire with the same diameter but have different lengths. Rank the magnitudes of the electric fields in the resistors from least to greatest
a.
E3 < E2 < E1.
b.
E2 < E1 = E3.
c.
E1 = E2 = E3.
d.
E1 = E3 < E2.
e.
E1 < E2 < E3.