Crossword on Beats and Sound

1. Physics Learning Object LO8 ­ Sound
Name:
Student Number:
Section:

2.
Across
4.​ a change in the direction of waves as they pass from one medium to another.
6.​ an increase (or decrease) in the frequency of sound, light, or other waves as the
source and observer move toward (or away from) each other. The effect causes the
sudden change in pitch noticeable in a passing siren, as well as the redshift seen by
astronomers. (two words)
8.​ the process in which two or more light, sound, or electromagnetic waves of the same
frequency combine to reinforce or cancel each other, the amplitude of the resulting
wave being equal to the sum of the amplitudes of the combining waves.
9.​ Unit for logarithmic comparisons of power or intensity.
11.​ a wave of concentric wavefronts. Simply put like concentric circles.
12.​ this type of wave have wave fronts that lie in _____ parallel to each other.
14.​ a general term that refers to any reduction in the strength of a signal.
Down
1.​ the ratio of the intensity of stress to the volume strain produced by stress. (two words)
2.​ was a French mathematician and physicist born in Auxerre and best known for
initiating the investigation of ____ series and their applications to problems of heat
transfer and vibrations.
3.​ speed of sound at sea level. (three words)
5.​ a unit used to measure the intensity of a sound or the power level of an electrical
signal by comparing it with a given level on a logarithmic scale.
7.​ Power delivered per unit area.
10.​ the type of amplitude variation where two waves that have slightly different
frequencies's amplitides increase and decrease as a function of time.
13.​ uniformly in all directions.
14.​ a style of instrumental music with electronic textures and no persistent beat, used to
create or enhance a mood or atmosphere.

3.
Answer Key:
Across
4. refraction.
6. dopplereffect
8. interference
9. db
11. spherical
12.plane
14.attenuation
Down
1. bulkmodulus
2. fourier
3. threehundredforty
5. decibel
7. intensity
10. beat