What phenomenon is created by two tuning forks, side by side, emitting frequencies, which differ by only a small amount?
a. resonance
b. interference
c. the Doppler effect
d. beats
d
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The Doppler technique can be used to measure the orbital period of a planet by
A) measuring the asymmetries in the velocity curve. B) measuring the amount by which the starlight is reduced when the planet transits. C) measuring the speed at which the star orbits the mutual center-of-mass of the star and planet. D) measuring the time it takes for the star's line-of-sight velocity to cycle from peak to peak.
Rainfall associated with an advancing cold front is generally
A) drizzly. B) heavy with gusty winds. C) slow and steady. D) light to moderate, with steady mild winds.
In what type of meteorites are Widmanstätten patterns found?
a. stony b. iron c. stony-iron d. carbonaceous e. centaur
A projectile is fired over a horizontal surface at an angle of elevation of 70°. Neglecting air resistance, what are possible angles in flight between the acceleration vector and the velocity vector?
a. 170° and 40° c. 90° and 15° b. 120° and 70° d. none of the above