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7. At what temperature, the speed of sound in air will becomes double of its value at 27°C? A. 27°C B. 54 °C C. 327°C D. 927°C

7. At what temperature, the speed of sound in air will becomes double of its value at 27°C? A. 27°C B. 54 °C C. 327°C D. 927°C

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7. At what temperature, the speed of sound in air will becomes double of its value at 27°C? C. 327°C A. 27°C B. 54 °C D. 927°C 8. The first overtone of a stretched wire of a given length is 320 Hz. The first harmonic is A. 640 Hz B. 480 Hz C. 320 Hz D. 160 Hz _9. An aircraft is moving away from you at half the speed of sound, which, on that day is about 340 m/s. The jet engines make a sound that is primarily about 300 Hz. What is the apparent frequency of the jet engines? A. 150 Hz B. 200 Hz C. 470 Hz D. 600 Hz _10. What is the frequency heard by a stationary observer when a train approaches with a speed of 30m/s? The frequency of the train horn is 600 Hz and the speed of sound is 340 m/s A. 570 Hz B. 630 Hz C. 653 Hz D. 658 Hz
Transcribed Image Text:7. At what temperature, the speed of sound in air will becomes double of its value at 27°C? C. 327°C A. 27°C B. 54 °C D. 927°C 8. The first overtone of a stretched wire of a given length is 320 Hz. The first harmonic is A. 640 Hz B. 480 Hz C. 320 Hz D. 160 Hz _9. An aircraft is moving away from you at half the speed of sound, which, on that day is about 340 m/s. The jet engines make a sound that is primarily about 300 Hz. What is the apparent frequency of the jet engines? A. 150 Hz B. 200 Hz C. 470 Hz D. 600 Hz _10. What is the frequency heard by a stationary observer when a train approaches with a speed of 30m/s? The frequency of the train horn is 600 Hz and the speed of sound is 340 m/s A. 570 Hz B. 630 Hz C. 653 Hz D. 658 Hz
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