_____ is the principal means of energy transport in the interiors of most stars
A) Conduction
B) Radiation
C) Evaporation
D) Advection
B
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Because the earth's orbit is slightly elliptical, the earth actually gets closer to the sun during part of the year. When the earth is closer to the sun its orbital speed is
A) less than when the earth is farthest away from the sun. B) the same as when the earth is farthest away from the sun. C) greater than when the earth is farthest away from the sun.
An 18-mm-wide grating has rulings of 710 lines per millimieter. Monochromatic light of wavelength 506 nm wavelength is incident normally on the grating. What is the largest angle from the centerline at which an intensity maximum is formed?
A) 46° B) 44° C) 42° D) 40° E) 38°
A capacitor with capacitance C is connected to a battery until charged, then disconnected from the battery. A dielectric having constant ? is inserted in the capacitor. What changes occur in the charge, potential and stored energy of the capacitor after the dielectric is inserted?
1.?V stays same, Q increases, U increases
2.?V stays same, Q decreases, U stays same
3.?V increases, Q decreases, U increases
4.?V decreases, Q stays same, U decreases
5.None of the above
6.Cannot be determined
A sinusoidal electromagnetic wave in vacuum delivers energy at an average rate of 5.00 µW/m2
What are the amplitudes of the electric and magnetic fields of this wave? (c = 3.0 x 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2)