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The loudness of a sound is directly proportional to the _ _ _ _ _ _ _ _ _ _ _ _ _ _ of the amplitude of vibration.A tuning fork is a U-shaped steel instrument where its two arms are called prongs and the handle is called the _ _ _ _ _ _ _ _ _ _ _ _ _ _.The human ear can only perceive sounds produced by vibrations within the audible frequency range of _ _ _ _ _ _ _ _ _ _ _ _ _ _ Hz to 20,000 Hz.Instruments like the harmonium, trumpet, and mouth organ produce sound when air is blown through their _ _ _ _ _ _ _ _ _ _ _ _ _ _.Sound cannot travel through a _ _ _ _ _ _ _ _ _ _ _ _ _ _ because there are no material particles present to transmit the wave.Sound is a form of energy that produces the sensation of _ _ _ _ _ _ _ _ _ _ _ _ _ _ in our ears.The SI unit of frequency is the _ _ _ _ _ _ _ _ _ _ _ _ _ _.A special device called _ _ _ _ _ _ _ _ _ _ _ _ _ _ was invented by Thomas Alva Edison to record and playback sound.A narrow slit is present between the two _ _ _ _ _ _ _ _ _ _ _ _ _ _ for the passage of air to produce sound in humans.The speed of sound in steel is approximately _ _ _ _ _ _ _ _ _ _ _ _ _ _ meters per second.Fish are able to produce sound when they vibrate their _ _ _ _ _ _ _ _ _ _ _ _ _ _.The characteristic of sound which determines its shrillness is called _ _ _ _ _ _ _ _ _ _ _ _ _ _.The to and fro or back and forth motion of an object in a fixed pattern about its mean position is called _ _ _ _ _ _ _ _ _ _ _ _ _ _ motion.Wavelength is represented along the x-axis by the Greek letter _ _ _ _ _ _ _ _ _ _ _ _ _ _.Birds produce sound when air passes through a ring of cartilage called the _ _ _ _ _ _ _ _ _ _ _ _ _ _ fixed at the lower part of their windpipes.To hear an echo clearly, the reflecting surface must be located at a minimum distance of _ _ _ _ _ _ _ _ _ _ _ _ _ _ meters from the source.The maximum displacement of a wave on either side of its mean position is called its _ _ _ _ _ _ _ _ _ _ _ _ _ _.The air trapped inside the hollow body of a stringed instrument forms an _ _ _ _ _ _ _ _ _ _ _ _ _ _ which enhances the sound.In the 17th century, the French scientist and philosopher _ _ _ _ _ _ _ _ _ _ _ _ _ _ made the earliest known attempt to measure the speed of sound in air.Sounds of frequencies higher than 20,000 Hz are called _ _ _ _ _ _ _ _ _ _ _ _ _ _ sounds.Human beings produce voice sounds with the help of an organ called the larynx or _ _ _ _ _ _ _ _ _ _ _ _ _ _.When a sound wave moves through a medium, there is a transfer of energy, but absolutely no transfer of _ _ _ _ _ _ _ _ _ _ _ _ _ _.Sound waves bounce back upon striking a surface, a process known as the _ _ _ _ _ _ _ _ _ _ _ _ _ _ of sound.
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Chapter: 06. Sound
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