When a sine wave is used to represent a sound wave, the crest corresponds to:
a. rarefaction.
b. condensation.
c. a point where molecules vibrate at a right angle to the direction of wave travel.
d. a region of low elasticity.
B
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The "oxygen crisis" occurred around
A) 2 billion years ago B) 3.5 billion years ago C) 2.5 billion years ago D) 4 billion years ago
If a nuclide has a decay constant of 0.765 × 10-6 s-1 and contains 3.0 × 1017 nuclei
(a) what is the half life? (b) what is its initial activity? (c) what is the activity after 12. days?
For general projectile motion if we neglect air, the horizontal component of a projectile's velocity
A) remains zero. B) remains a non-zero constant. C) continuously increases. D) continuously decreases. E) first decreases and then increases.
If the intensity level by 15 identical engines in a garage is 100 dB, what is the intensity level generated by each one of these engines?
A) 67 dB B) 13 dB C) 44 dB D) 88 dB