need help on physics question?????

Posted on 2014-11-20 06:54:00 in Physics by LAYSON

1. When a standing wave exists on a string, points of destructive
interference are called
a) modes
b) antinodes
c) nodes

2.Standing waves are formed by the interference of two waves
which travel
a) in the same direction
b) at right angles to each other
c) in opposite directions

3. Open tubes produce all harmonics, while
tubes closed at one end produce only
a) every fifth harmonic
b) odd harmonics
c) even harmonics

4. When the speed of sound increases (e.g.,
because of a rise in air temperature), the harmonic frequencies
a) decrease
b) stay the same
c) increase

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