SATHEE: Wave Motion 4 Question 20

Wave Motion 4 Question 20

19. A bus is moving towards a huge wall with a velocity of $5 m s^{- 1}$ . The driver sounds a horn of frequency $200 H z$ . The frequency of the beats heard by a passenger of the bus will be ….. Hz. (Speed of sound in air $= 342 m s^{- 1}$ )

(1992, 2M)

True / False

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Answer:

Correct Answer: 19. (a)

Solution:

Frequency of refracted sound

$\begin{matrix} \vec{v_{O}} = 5 m / s \\ f^{'} = f (\frac{\overset{⇀}{v + v_{o}}}{v - v_{s}}) = 200 (\frac{342 + 5}{342 - 5}) H z = 205.93 H z \end{matrix}$

$∴$ Beat frequency $= f^{'} - f = (205.93 - 200)$

$= 5.93 H z ≃ 6 H z$

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Wave Motion 4 Question 20

19. A bus is moving towards a huge wall with a velocity of $5 m s^{- 1}$ . The driver sounds a horn of frequency $200 H z$ . The frequency of the beats heard by a passenger of the bus will be ….. Hz. (Speed of sound in air $= 342 m s^{- 1}$ )

True / False

Answer:

इंजीनियरिंग की तैयारी

चिकित्सा तैयारी

एनसीईआरटी पुस्तकें और समाधान

महत्वपूर्ण संसाधन

अन्य संसाधन

पाठ्यक्रम

परीक्षा मंच

नमूना मॉक टेस्ट

सदस्यता

एनसीईआरटी व्यायाम वीडियो समाधान

Wave Motion 4 Question 20

19. A bus is moving towards a huge wall with a velocity of 5ms−1. The driver sounds a horn of frequency 200Hz. The frequency of the beats heard by a passenger of the bus will be ….. Hz. (Speed of sound in air =342ms−1 )

True / False

Answer:

इंजीनियरिंग की तैयारी

चिकित्सा तैयारी

एनसीईआरटी पुस्तकें और समाधान

महत्वपूर्ण संसाधन

अन्य संसाधन

पाठ्यक्रम

परीक्षा मंच

नमूना मॉक टेस्ट

सदस्यता

एनसीईआरटी व्यायाम वीडियो समाधान

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19. A bus is moving towards a huge wall with a velocity of $5 m s^{- 1}$ . The driver sounds a horn of frequency $200 H z$ . The frequency of the beats heard by a passenger of the bus will be ….. Hz. (Speed of sound in air $= 342 m s^{- 1}$ )