Loudness, The strength/ intensity of sound wave. It shows the energy content in a wave., amplitude, loudness is also ... of the wave., frequency, Pitch is also known as ....., amplitude, Soft voice has low, frequency, High pitch has high, pitch, When a string increase the tightness and decrease the thickness, the .....will increase., timbre, Different shape or method of sound production is known as, echo, When sound being reflected, .... is produced., rough, soft, Sound absorbed by ....surface., solid, Sound travels fastest in, vacuum, Sound cannot travel in, vibration, Sound produced by, wave, Sound propagates/transmits in the form of, decibel (dB), Unit for loudness, Hertz (Hz), Unit for frequency, 20 to 20000 Hz, Audible sound range of human being is, infrasound, Sound that is below 20 Hz is, ultrasound, Sound that is too high pitch (above 20000 Hz) is, Infrasound, .... is produced by elephant and rhino, it can be used to detect earthquake and leakage of natural gas., ultrasound, Sound that is used in pregnancy scan is

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