Two small speakers are separated by a distance of 7 cm, as shown. The speakers a
ID: 2254277 • Letter: T
Question
Two small speakers are separated by a distance of 7 cm, as shown. The speakers are driven in phase with a sine wave signal of frequency 15 kHz. A small microphone is placed a distance 1.4 m away from the speakers on the axis running through the middle of the two speakers, and the microphone is then moved perpendicular to the axis. Where does the microphone record the first minimum of the interference pattern from the speakers as measured from the axis? The speed of sound in air is 343 m/s
( ) m (from axis)
Enter the rainfall for month 1 : 1 Enter the rainfall for month 2 : 2 Enter the rainfall for month 3 : 3 Enter the rainfall for month 4 : 4 Enter the rainfall for month 5 : 5 Enter the rainfall for month 6 : 6 Enter the rainfall for month 7 : 7 Enter the rainfall for month 8 : 8 Enter the rainfall for month 9 : 9 Enter the rainfall for month 10 : 10 Enter the rainfall for month 11 : 11 Enter the rainfall for month 12 : 12 The total rainfall for the year is 78.00 inches. The average rainfall for the year is 6.50 inches. The largest amount of rainfall was 1.00 inches in month 12. The smallest amount of rainfall was 1.00 inches in month 1. Here are the rainfall amount, sorted in ascending order: 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 Press any key to continu ...-Explanation / Answer
theta _max = arcsin(lamda/d ) = 29.34
y_max = Ltantheta_max = 1.4*tan(29.34) = 78.7 cm
theta min = arcsin lamda/2*d = Ltantheta_min = 1.4tan14.2 = 35.4 cm
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