A clarinet behaves like a tube closed at one end. If its length is 1.0 m, and the velocity of sound is 344 m/s, what is its fundamental frequency (in Hz)?
A. 264
B. 140
C. 86
D. 440
E. 172
Answer: C
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What is the threshold of hearing?
A) 0.1 decibel B) 0.01 decibel C) 1 decibel D) 10 decibel E) none of the above
If I0 = 10?12 W/m2 is the threshold of hearing, a sound with intensity I1 = 10?11 W/m2 will give a certain decibel level. Suppose a new sound has an intensity I2 = 2I12/I0 . What is the new decibel level?
a. 2.3 dB b. 23 dB c. 100 dB d. it will square the decibel level e. 1.0 dB
Point charges of equal magnitudes (25 nC) and opposite signs are placed on (diagonally) opposite corners of a 60-cm × 80-cm rectangle. If point A is the corner of this rectangle nearest the positive charge and point B is located at the intersection of the diagonals of the rectangle, determine the potential difference, VB?VA.
A. ?47 V B. +94 V C. zero D. ?94 V E. +47 V
The deepest and most powerful earthquakes occur at ___________.
A) Mid-ocean ridges B) Continental rifts C) Subduction zones D) Transform faults