Pitch- description of how high or lowthe sound seems to a person. Loudness-how loud or soft a sound isperceived to be.
Sound Loudness (dbs) Hearing DamageAverage Home 40-50Loud Music 90-100 After long exposureRock Concert 115-120 ProgressiveJet Engine 120-170 Pain
Ultrasound- sound waves with frequencies above thenormal human range of hearing. Sounds in the range from 20-100kHzInfrasound- sounds with frequencies below the normal human range of hearing.Sounds in the 20-200 Hz range
the result of two or more sound waves overlapping
Different sounds that you hear include(A) noise, (B) pure tones, and (C) musicalnotes.
Doppler Effectis the apparent change in the frequency of a sound caused by the motion of either the listeneror the source of the sound.
Sounds from Moving Sources. A moving source of sound or a moving observer experiences an apparent shift of frequency called the Doppler Effect. If the source is moving as fast or faster than the speed of sound, the sound waves pile up into a shock wave called a sonic boom. A sonic boom sounds very much like the pressure wave from an explosion
Resonancethe frequency of sound wavesexactly matches the natural frequencyof an object.
On December 26, they were playing in the sea when Tilly suddenly found the water was bubbling, like on top of a beer. She immediately realized tsunami was coming because the scene reminded her of a geography lesson about Hawaiis 1946 tsunami. Right away, Tilly told her parents, sister and other tourists to escape quickly, but at first they were in half belief. However, seeing Tillys serious and firm expression, people started to be convinced of the seriousness of the thing and instantly left the beach. At last over 100 tourists were ended up in safety with no death