The nearest star is at a distance of 4.4 light-years. Given that light travels at 300,000 km/s in space, how far away is the nearest star in kilometers (km)?
A) 4.2 1013 km
B) 2.7 1015 km
C) 3.0 108 km
D) 9.5 1012 km
A
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It is possible to detect Doppler shifts due to light on each side of a rapidly spinning star. Suppose it is seen that a nearby star, relatively stationary to us, is blueshifted in light on one side of the star and redshifted in the light from the other side. Suppose a star of radius 
km has light shifted from 525 nm to 527 nm on one side and to 523 nm on the other. What is the rotational period of the star?
A. 34 h B. 32 h C. 24 h D. 16 h
The y component of the electric field of an electromagnetic wave traveling in the +x direction through vacuum obeys the equation Ey = (375 N/C) cos[kx - (2.20 × 1014 rad/s)t]. What is the wavelength of this electromagnetic wave? (c = 3.0 × 108 m/s)
A) 0.272 µm B) 1.36 µm C) 2.72 µm D) 8.57 µm E) 17.1 µm
Hydrocarbons containing carbon-carbon double bonds are
a. alkenes. b. cycloalkanes. c. alkynes. d. alkanes. e. ketones.
Suppose you live on the near side of the Moon in the crater Copernicus. How often will the Sun set below your horizon?
a. Every 12 hours b. Every 24 hours c. Every 29.5 days d. Never