http://labman.phys.utk.edu/phys221core/Extra/extra_credit_6.htm Question 4 Which

Question

http://labman.phys.utk.edu/phys221core/Extra/extra_credit_6.htm

Question 4

Which of the following statements are true? You can choose more than one statement.

(a) The speed of the 200 Hz wave is ~335 m/s.
(b) The speed of the 400 Hz wave is ~ half that of the 200 Hz wave.
(c) The speed of the 400 Hz wave is ~ twice that of the 200 Hz wave.
(d) The wavelength of the 400 Hz wave is ~ 80 - 85 cm.

Click the "Two Source Interference" tab. Choose a frequency of 100 Hz and maximum amplitude. Move the head of the listener as far away from the speakers as possible and then straight up and down through the region where the waves from the two speakers intersect. Listen to the sound.

Question 5

Which of the following statements are true? You can choose more than one statement.

(a) The volume of the sound is uniform, it does not depend on the vertical position of the head.
(b) The volume of the sound increases as the head moves vertically from the bottom to the top.  
(c) The volume of the sound decreases as the head moves vertically from the bottom to the top.
(d) There are two locations, symmetric about the centerline, where no sound can be heard.
(e) The head moves through 3 locations where the sound waves interfere constructively and two locations where the sound waves interfere destructively.

Explanation / Answer

answer 4

(b) The speed of the 400 Hz wave is ~ half that of the 200 Hz wave.

answer 5

(e) The head moves through 3 locations where the sound waves interfere constructively and two locations where the sound waves interfere destructively.

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