Sound (continued)
Gbogbo ọrọ náà
Thunder rolls in seconds after the lightning flash, a shout returns as an echo from a cliff, and an unborn baby is imaged with sound too high-pitched to hear. Sound is a wave that travels through matter, and by timing it, reflecting it and pushing its frequency above hearing we can measure distances, find flaws and see inside the body.
In this lesson you will measure the speed of sound in air from a distance and a time, describe how amplitude and frequency set the loudness and pitch of a note, define an echo and ultrasound, and use ultrasound in sonar and scanning, including calculating depth or distance from the travel time and the wave speed.
Ebumnobi
- Describe a method involving a measurement of distance and time for determining the speed of sound in air
- Describe how changes in amplitude and frequency affect the loudness and pitch of sound waves
- Describe an echo as the reflection of sound waves
- Define ultrasound as sound with a frequency higher than 20 kHz
- [Supplement] Describe the uses of ultrasound in non- destructive testing of materials, medical scanning of soft tissue and sonar including calculation of depth or distance from time and wave speed
Nkuzi Olu
Gee ntị na nkuzi a na ngwa
Maapụ uche
E seela isiokwu a ka ị hụ otu echiche si ejikọta.
Mepee maapụ uche na ngwa
Kaadị ncheta
Omume ncheta ngwa ngwa n'ihe a na-anwale n'isiokwu a.
Mee omume kaadị ndị a na ngwa
Akwụkwọ Ọmụmụ
Ndetu Nkuzi Zuru Ezu di na Ngwa Green Bridge
Nweta ngwa Green Bridge CBT na ekwenti gi ma o bu kompiuta maka ulo akwukwo IGCSE zuru oke: akwukwo ule ndi gara aga, usoro nyocha, eserese uche, kaadi omumu na nkuzi olu.
Nnyocha Ọmụmụ
Ekele diri gi maka imecha ihe karịrị na Sound (continued). Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.
Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.
Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.
- The approximate speed of sound in air is A. 3 m/s B. 34 m/s C. 340 m/s D. 3 x 10^8 m/s Answer: C
- Increasing the amplitude of a sound wave increases its A. pitch B. frequency C. loudness D. speed Answer: C
- Ultrasound is defined as sound with a frequency higher than A. 20 Hz B. 200 Hz C. 2 kHz D. 20 kHz Answer: D
- An echo returns from a wall 1.0 s after a clap. The wall is 170 m away. The speed of sound is A. 85 m/s B. 170 m/s C. 340 m/s D. 680 m/s Answer: C
- A sonar pulse takes 0.4 s to return from the seabed (speed 1500 m/s). The depth is A. 150 m B. 300 m C. 600 m D. 1200 m Answer: B
Rue ajuju ndi a n'ime ngwa ahu
Rue ajuju ndi a n'ime ngwa ahu
Akwụkwọ A Na-atụ Aro
Mụtakwuo ihe site na isi mmalite mepere emepe
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Akụkụ akwụkwọ
Ultrasound
Any sound with a frequency above 20,000 Hz (or 20 kHz)—that is, above the highest audible frequency—is defined to be ultrasound. In practice, it is possible to create ultrasound frequencies up to more than a gigahertz. (Higher frequencies are difficult to create; furthermore, they propagate poorly b
"College Physics: Ultrasound" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/college-physics/pages/17-7-ultrasound. Access for free at https://openstax.org/books/college-physics/pages/1-introduction
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Akụkụ akwụkwọ
Sound Intensity and Sound Level
Relate amplitude of a wave to loudness and energy of a sound wave
"Physics: Sound Intensity and Sound Level" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/physics/pages/14-2-sound-intensity-and-sound-level. Access for free at https://openstax.org/books/physics/pages/1-introduction
Ndị otu ndị ọzọ bipụtara ha n'okpuru ikike mepere emepe, anyị na-ekele ha dị ka ha si chọọ. Njikọ na-emepe saịtị ha.
Meecha Ajụjụ Ule Ọmarịcha
Ị chọrọ ime ajụjụ ule ọmarịcha gbasara Sound (continued)? Budata ngwa Green Bridge CBT iji nweta ajụjụ ule ọmarịcha na nyocha zuru ezu gbasara isiokwu a.
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Ihe nile ichoro iji nwee ihe ịga nke ọma na JAMB, WAEC & NECO.
