Sciences - Co-ordinated (9-1) - 0973 CIE

Sound

Bayani Gaba-gaba

Pluck a guitar string, hit a drum or speak, and something vibrates. That vibration pushes on the air, and a wave of squeezes and stretches travels outward until it reaches your ear. Sound is a wave you can hear, but only within a certain range of frequencies and only when there is material for it to travel through.

In this topic you will describe how sound is produced by vibrating sources, learn that sound is a longitudinal wave made of compressions and rarefactions, and meet the range of frequencies humans can hear. You will also learn why sound needs a medium, how fast it travels in air, and why it travels faster in solids than in liquids or gases.

Manufura

Describe the production of sound by vibrating sources
Describe the longitudinal nature of sound waves
State the approximate range of frequencies audible to humans as 20 Hz to 20 000 Hz
Know that a medium is needed to transmit sound waves
Know that the speed of sound in air is approximately 330-350 m / s
[Supplement] Describe compression and rarefaction
[Supplement] Know that, in general, sound travels faster in solids than in liquids and faster in liquids than in gases

Takardar Darasi

Sound underlies speech, music, sonar, ultrasound scans and noise control. Understanding that it is a longitudinal wave that needs a medium explains why there is silence in space and why you hear an approaching train through the rail before the air. Exam questions test the production, nature, speed and audible range of sound.

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Zazzage manhajar Green Bridge CBT a wayar ka ko kwamfyuta ka don samun cikakkiyar bayanan darasi, tambayoyin aiki, da ƙari.

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Nazarin Darasi

Barka da kammala darasi akan Sound. Yanzu da kuka bincika mahimman raayoyi da raayoyi, lokaci yayi da zaku gwada ilimin ku. Wannan sashe yana ba da ayyuka iri-iri Tambayoyin da aka tsara don ƙarfafa fahimtar ku da kuma taimaka muku auna fahimtar ku game da kayan.

Za ka gamu da haɗe-haɗen nau'ikan tambayoyi, ciki har da tambayoyin zaɓi da yawa, tambayoyin gajeren amsa, da tambayoyin rubutu. Kowace tambaya an ƙirƙira ta da kyau don auna fannoni daban-daban na iliminka da ƙwarewar tunani mai zurfi.

Yi wannan ɓangaren na kimantawa a matsayin wata dama don ƙarfafa fahimtarka kan batun kuma don gano duk wani yanki da kake buƙatar ƙarin karatu. Kada ka yanke ƙauna da duk wani ƙalubale da ka fuskanta; maimakon haka, ka kallesu a matsayin damar haɓaka da ingantawa.

A sound wave is best described as: A. a transverse wave B. a longitudinal wave C. an electromagnetic wave D. a stationary wave Answer: B
The approximate range of frequencies audible to humans is: A. 2 Hz to 2000 Hz B. 20 Hz to 20 000 Hz C. 200 Hz to 200 000 Hz D. 0 Hz to 100 Hz Answer: B
Sound travels fastest in: A. a gas B. a liquid C. a solid D. a vacuum Answer: C
An echo returns from a wall 510 m away in 3.0 s. The speed of sound is: A. 170 m/s B. 340 m/s C. 1530 m/s D. 255 m/s Answer: B
A region of a sound wave where particles are pushed together is a: A. rarefaction B. crest C. compression D. trough Answer: C