Sound
Overzicht
Hold a finger against your throat and hum. What you feel is the whole of this topic in one sensation: something is shaking, and because it is shaking you can hear it. Every sound that has ever reached you began as a vibration and arrived as a vibration, carried across the room by air that squashes and stretches hundreds or thousands of times a second without ever travelling anywhere itself. Take the air away and the vibration has nothing to ride on, which is why the loudest explosion in space would reach you in complete silence.
This lesson takes that idea and turns it into physics you can calculate with. You will learn why a sound is high or low and why it is quiet or deafening, where the two limits of your own hearing sit, and what happens when a sound wave runs into a wall or squeezes through a doorway. You will learn to turn a clap and a stopwatch into a measurement of the speed of sound, and to run the wave equation both ways for a sound wave you cannot hear. There are only three statements in this topic and every one of them is Core Tier, so whichever tier you are entered for, all of it is yours to know.
Doelstellingen
- Sound waves are longitudinal waves and cause vibrations in a medium, which are detected as sound. The range of human hearing is about 20 Hz to 20 000 Hz. No details of the structure of the ear are required.
- The pitch of a sound is determined by the frequency of vibrations of the source. Its loudness is related to the size of the amplitude of the disturbance.
- Sound waves can be reflected (echoes) and diffracted.
Mindmap
Dit onderwerp is in kaart gebracht zodat je ziet hoe de ideeen samenhangen.
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Lesnotitie
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Lesevaluatie
Gefeliciteerd met het voltooien van de les op Sound. Nu je de sleutelconcepten en ideeën, het is tijd om uw kennis op de proef te stellen. Deze sectie biedt een verscheidenheid aan oefeningen vragen die bedoeld zijn om uw begrip te vergroten en u te helpen uw begrip van de stof te peilen.
Je zult een mix van vraagtypen tegenkomen, waaronder meerkeuzevragen, korte antwoordvragen en essayvragen. Elke vraag is zorgvuldig samengesteld om verschillende aspecten van je kennis en kritisch denkvermogen te beoordelen.
Gebruik dit evaluatiegedeelte als een kans om je begrip van het onderwerp te versterken en om gebieden te identificeren waar je mogelijk extra studie nodig hebt. Laat je niet ontmoedigen door eventuele uitdagingen die je tegenkomt; beschouw ze in plaats daarvan als kansen voor groei en verbetering.
- What type of wave is a sound wave? A. A transverse wave B. A longitudinal wave C. An electromagnetic wave D. A wave that needs no medium Answer: B
- What is the approximate range of frequencies that a human can hear? A. 2 Hz to 2000 Hz B. 20 Hz to 20 000 Hz C. 200 Hz to 200 000 Hz D. 20 000 Hz to 2 000 000 Hz Answer: B
- A guitar string is plucked harder but is not shortened or retuned. What happens to the sound? A. It becomes louder and higher in pitch B. It becomes louder with the pitch unchanged C. It becomes higher in pitch with the loudness unchanged D. It becomes quieter and lower in pitch Answer: B
- A student stands 100 m from a wall and claps. She hears the echo 0.60 s later. What is the speed of sound in air from her measurement? A. 60 m/s B. 167 m/s C. 333 m/s D. 600 m/s Answer: C
- Why can you hear a person speaking round the corner of a solid wall but not see them? A. Sound travels faster than light B. Sound has a wavelength comparable to the wall and diffracts appreciably, while light has a far shorter wavelength and diffracts negligibly C. Sound is a transverse wave and light is longitudinal D. Sound is reflected by the wall and light is absorbed by it Answer: B
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Aanbevolen Boeken
Oefen Proefexamenvragen
Wilt u proefexamenvragen over Sound oefenen? Download de Green Bridge CBT-app voor toegang tot proefexamenvragen en volledige oefentoetsen over dit onderwerp.
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