The energy per unit volume in an electromagnetic wave is
A) equally divided between the electric and magnetic fields.
B) mostly in the electric field.
C) mostly in the magnetic field.
D) all in the electric field.
E) all in the magnetic field.
A
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The boundary shown is that of a uniform magnetic field directed in the positive z direction. An electron enters the magnetic field with a velocity pointing along the x axis and exits 0.63 ?s later at point A. What is the magnitude of the magnetic field?
a.
18 ?T
b.
14 ?T
c.
28 ?T
d.
34 ?T
e.
227 ?T
The temperature of an ideal gas in a sealed 0.40-m3 rigid container is reduced from 350 K to 270 K. The final pressure of the gas is 60 kPA
The molar heat capacity at constant volume of the gas is 28.0 J/mol • K. The heat absorbed by the gas is closest to A) -24 kJ. B) -31 kJ. C) 24 kJ. D) 31 kJ. E) 0.00 kJ.
A rock is thrown upwards at an angle of 40° with respect to the horizontal. As the rock is rising in its trajectory, the vertical component of its velocity
A) increases. B) decreases. C) remains the same. D) is zero. E) Cannot be determined without additional information.
The ratio of a photon's energy to its frequency is
A) its speed. B) its wavelength. C) its amplitude. D) Planck's constant. E) none of the above