Which medium allows sound to travel the fastest?, Gas, Liquid, Solid, Vacuum, Which surface is a good sound absorber?, Marble tiles, Wall, Carpet, Glass, What determines the loudness of sound?, Amplitude, Wavelength, Frequency, Speed, What determines the pitch of sound?, Amplitude, Frequency, Volume, Medium, What is the unit of frequency?, Decibel (dB), Metre (m), Hertz (Hz), Newton (N), What happens to the frequency heard when an ambulance approaches an observer?, It decreases, It increases, It becomes zero, It remains unchanged, What is an echo?, Sound absorbed by a soft surface, Sound produced by vibration, Sound reflected from a hard surface, Sound travelling through a vacuum, Which sound wave has a frequency higher than 20,000 Hz?, Infrasound, Ultrasound, Audible sound, Echo, Which device uses reflected sound waves to detect underwater objects?, Stethoscope, Megaphone, Hearing aid, Sonar, What causes sound to be produced?, Vibration, Light, Heat, Electricity
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SNF2.SOUND WAVES
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Mkhniayub
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