SELECT * FROM question_mgmt as q WHERE id=4245 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=8 AND subId=16 AND chapterId=192 and ex_no='11' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 9th science Sound a person has a hearing range from 20 hz to 20 khz

Question:

A person has a hearing range from 20 Hz to 20 kHz. What are the typical wavelengths of sound waves in air corresponding to these two frequencies? Take the speed of sound in air as 344 m s-1.

Answer:

Hearing range for humans = 20 Hz to 20 kHz

Speed of sound = 344 m/s

For a sound wave,

Speed = Wavelength × Frequency

 
i. For = 20 Hz
 

ii. For  = 20,000 Hz
 
 
Hence, for humans, the wavelength range for hearing is 0.0172 m to 17.2 m.


SELECT ex_no,question,question_no,id,chapter FROM question_mgmt as q WHERE courseId='8' AND subId='16' AND ex_no!=0 AND status=1 and id!=4245 ORDER BY views desc, last_viewed_on desc limit 0,10
SELECT ex_no,question,question_no,id,chapter FROM question_mgmt as q WHERE courseId='8' AND subId='16' AND ex_no!=0 AND status=1 and id!=4245 ORDER BY last_viewed_on desc limit 0,10

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  • 4 months ago

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  • Answered by Ekta Mehta
  • 4 months ago

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