Which interacts more with light of relatively high frequencies?
A) large particles
B) small particles
C) both the same
Answer: B
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As you stand by the side of the road, a car approaches you at a constant speed, sounding its horn, and you hear a frequency of 76 Hz. After the car goes by, you hear a frequency of 65 Hz
What is the speed of the car? The speed of sound in the air is 343 m/s. A) 26 m/s B) 27 m/s C) 28 m/s D) 29 m/s E) 30 m/s
How does the axial tilt of Mars compare with our own?
A) Like Jupiter, Mars always keeps its equator pointing at the Sun. B) It is about half our own, 12 degrees. C) It is almost identical to the Earth. D) Like Saturn, it's about 27 degrees. E) Like Uranus, it is 98 degrees and flopped over on its side.
According to our definition, we have been a technological civilization for about
A) 500 years. B) 100 years. C) 10 years. D) 1000 years. E) 10,000 years.
A proton is moving at 
m/s and experiences a magnetic force of magnitude 
If the magnetic field makes an angle of 40
with respect to the velocity of the proton, what is the field's magnitude?
A. 
B. 
C. 
D. 
E. 