The mechanism must be dismantled before using ultrasound on it. Ultrasound can be used to clean delicate mechanisms. Which of the following statements is NOT true? Speakers are opposite to microphones because they turn electrical signals into sound waves.ġ9.) Ultrasound can be used for industrial cleaning. The signals from a microphone can be recorded. The currents from a microphone are very big and are amplified into much smaller signals by an amplifier.
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Which of the following statements is NOT true?Īn electrical signal is a varying electrical current. Which graph shows the sound with two wavelengths?ġ8.) Microphones turn sound waves into electrical signals. Which graph shows the sound with the highest frequency?ġ7.) The graphs show how the displacement of air molecules changed with time when different sound waves were passing. Which graph shows the sound with the biggest amplitude?ġ6.) The graphs show how the displacement of air molecules changed with time when different sound waves were passing. They show how the displacement of air molecules changed with time when different sound waves were passing. What will happen to the pitch of this sound if the mass on the wire is increased?ġ5.) Study the graphs carefully. When the wire is plucked, it emits a sound. Lengthening, loosening or using a thicker string on a stringed instrument will make the note produced sound lower.ġ4.) A steel wire is stretched over a pulley by a large mass. Shortening, tightening or using a thinner string on a stringed instrument will make the note produced sound higher. The higher the frequency of a sound, the lower its pitch. The frequency of a sound wave is the number of complete vibrations it makes each second. It would be louder, with the pitch unchanged.ġ3.) Which of the following statements is NOT true about the frequency of a sound wave? It would have the same pitch, but would be quieter. If the cone is made to vibrate with a bigger amplitude, what would the effect be on the sound produced? Which one of the terms is related most closely to loudness in the case of a sound wave?ġ2.) A loudspeaker consists of a cone which vibrates to and fro. Wearing ear plugs will reduce the amplitude of sound waves entering your ears.īy sound waves being refracted from hard flat surfaces.īy sound waves being reflected from hard flat surfaces.īy sound waves being diffracted from soft surfaces such as curtains and carpets.īy sound waves being refracted from soft surfaces such as curtains and carpets.ġ1.) The following answers are four terms which may be used when referring to a wave. Sound insulation in buildings such as acoustic tiles, curtains and carpets will reduce noise pollution. Which of the following statements is NOT true about methods of reducing noise pollution?ĭouble-glazing does not reduce noise pollution but only heat loss.įitting silencers to engines and mufflers to other machinery will reduce noise pollution. There is no evidence that excessive noise caused by personal stereos and loud machinery, damages your hearing.ĩ.) Noise pollution can cause stress and distraction.
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The upper hearing limit decreases with age. The normal range of human hearing is 20Hz to 20,000Hz. Sound waves generally travel faster in gasses than in liquids, and faster in liquids than in solids.Ĩ.) Which of the following statements is NOT true about hearing? Sound waves can be reflected, refracted and diffracted, but they can not travel through a vacuum. Sound waves are caused by vibrating objects.
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The disturbances are at right angles to the direction in which the wave is travellingĥ.) Which of the following waves is a longitudinal wave?Ħ.) Which of the statements below is correct about waves?Īll waves carry energy without transferring matter.Īll waves carry energy by transferring matter.ħ.) Sound waves travel at various speeds in different substances. The disturbances are parallel to the direction in which the wave is travelling They do not vary in wavelength, but only vary in speed They do not vary in speed, but only vary in wavelength Which of the answers below correctly shows the type of waves produced by each hand movement?Ĥ.) Light waves are transverse. The frequency of a wave is the number of complete waves being emitted per secondģ.) The diagram shows a spring that can be moved in two directions, 'X' and 'Y'. The amplitude of a wave is the vertical distance from a trough to a peak The period of a wave is the time taken for one complete cycle of the wave Which of the statements below correctly describes the distance stated?Ģ.) Which of the following statements is NOT true about wave features? It shows a wave with three distances marked 'X', 'Y' and 'Z' respectively.