The vibrations of a longitudinal wave move
A) along the direction of wave travel.
B) at right angles to the direction of wave travel.
C) that changes with speed.
Answer: A
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A negatively-charged particle moves across a constant uniform magnetic field that is perpendicular to the velocity of the particle. The magnetic force on this particle
A) is in the same direction as the particle's velocity. B) causes the particle to slow down. C) causes the particle to speed up. D) is opposite the direction of the particle's velocity. E) causes the particle to accelerate.
Meanders
A) migrate downstream. B) shorten the stream. C) migrate upstream. D) remain in one place.
If evaporation exceeds precipitation, the salinity of the ocean in that area
A) decreases. B) stays the same. C) gets denser. D) increases.
What is the magnification of a telescope and eyepiece if the telescope objective has a focal length of 200 cm and the eyepiece has a focal length of 2.0 cm
a. 400 times b. 4000 times c. 100 times d. 1000 times e. 40 times