As a body heats, the radiation it emits ________.
A. decreases in intensity
B. peaks at a shorter wavelength
C. increases in wavelength
D. peaks at a longer wavelength
E. All of these choices are correct.
Answer: B
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The speed of light is 3.0 × 10^5 km/s, and it takes 1.3 s for light to travel from the Moon to Earth. From this information, what is the distance to the Moon?
a. 390,000 km b. 230,000 km c. 3.9 km d. 2.3 km e. 4.3 × 10^5 km
Imagine placing a magnet in a uniform magnetic field (a field whose vectors have the same magnitude and direction at all points). Will the field exert a net force on the magnet (that, is, a force that causes the magnet’s center of mass to accelerate)? If so, in what direction? (Hint: Use the dipole analogy.)
A. Yes, in the direction of the magnetic field. B. Yes, opposite to the magnetic field’s direction. C. Yes, in a direction perpendicular to the magnetic field. D. Yes, in a direction that depends on the magnet’s orientation relative to the field. E. No, the net force on the magnet is zero.
Astronomers are surprised that the radial-velocity method for detecting planets has not discovered more smaller, Earth-like planets.
Answer the following statement true (T) or false (F)
Our best stellar parallax measurements to date come from
A) observations made by astronauts. B) radio interferometry. C) the Keck telescope. D) the Hipparcos satellite. E) ground based measurements taken six months apart.