If the rest wavelength of a certain line is 600 nm, but we observe it at 594 nm, then:
A) the source is approaching us at 1 % of the speed of light.
B) the source is approaching us at 0.1 % of the speed of light.
C) the source is receding from us at 10% of the speed of light.
D) the source is getting 1% hotter as we watch.
E) the source is spinning very rapidly, at 1% of the speed of light.
A
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The fact that the Earth has moved along its orbit in the time it took to rotate once is the reason for
A) the position of the Celestial Equator. B) precession. C) the difference between solar and sidereal time. D) Earth's 23.5-degree tilt. E) seasons.
Predict the mass diffusivity of benzene, C6 H6, in air at 20ºC and 1 atm pressure using Equation 8-24. Compare this value to that from experimental values.
Power: During a period of high power demand, the voltage output of the power company is reduced by 5.0%. By what percentage is the power in a resistor decreased?
A. 2.5% B. 5.0% C. 10% D. 15% E. 90%
In an electromagnetic wave, 1) how are the electric and magnetic field directions related and 2) how is the direction of travel determined from their directions? (
is the velocity of the light wave.)
A.
.B.
C.
D.
E.
