1
NEET 2017
+4
-1
The two nearest harmonics of a tube closed at one end and open at other end are 220 Hz and 260 Hz. What is the fundamental frequency of the system ?
A
20 Hz
B
30 Hz
C
40 Hz
D
10 Hz
2
NEET 2017
+4
-1
Two cars moving in opposite directions approach each other with speed of 22 m s$$-$$1 and 16.5 m s$$-$$1 respectively. The driver of the first car blows a horn having a frequency 400 Hz. The frequency heard by the driver of the second car is (velocity of sound is 340 m s$$-$$1)
A
361 Hz
B
411 Hz
C
448 Hz
D
350 Hz
3
NEET 2016 Phase 2
+4
-1
Three sound waves of equal amplitudes have frequencies (n $$-$$ 1), n, (n + 1). They superimpose to give beats. The number of beats produced per second will be
A
1
B
4
C
3
D
2
4
NEET 2016 Phase 2
+4
-1
The second overtone of an open organ pipe has the same frquency as the first overtone of a closed pipe L metre long. The length of the open pipe will be
A
L
B
2L
C
$${L \over 2}$$
D
4L
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