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Please help with this multipart question :( need help understanding

Question 3 The frequency driving an open-closed tube is steadily raised. Resonances are heard at 500 Hz and 700 Hz with none in between. What is the fundamental and next highest (n-2) harmonic frequency? Select the correct answer O 200 Hz, 300 Hz O 100 Hz, 300 Hz 200 Hz, 400 Hz our Answer O 100 Hz, 200Hz

A speaker emits a sound of frequency f, which is received by an observer to his right. Suppose there is a strong wind blowing to the right. Given what you know about the Doppler effect, what do you expect for the frequency f of the sound received by the observer? Select the correct answer O The answer depends on the exact value of f of = f O The answer depends on the distance between speaker and observer

A violinist in an orchestra plays the note middle A (440Hz). Which of the following objects will cast a substantial sound shadow blocking the sound of the note from being heard behind the object? Assume room temperature air. Select the correct answer O None of the listed objects O A column, 50cm across All of the listed objects Your O A wall 2m across. O The conductor, approximately 30cm across

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子に500t( 군 1カ 2- 2 Simie hay med-

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