HARD
Earn 100

Two sound waves of frequencies 100 Hz and 102 Hz and having same amplitude ‘A’ are interfering. A detector which can detect waves of amplitude greater than or equal to A is kept at rest. In a time interval of 12 seconds, find the total duration in which detector is active.
(a)2 sec
(b)4 sec
(c)6 sec
(d)8 sec

50% studentsanswered this correctly
Important Questions on Wave Motion on a String
MEDIUM

EASY

MEDIUM

EASY
The equations of two waves are given by :
These waves are simultaneously passing through a string. The amplitude of the resulting wave is :

EASY

HARD

MEDIUM

HARD
Two identical coherent sound sources and with frequency are apart. An observer standing equidistant from the source and at a perpendicular distance of from the line hears maximum sound intensity.
When he moves parallel to , the sound intensity varies and is a minimum when he comes directly in front of one of the two sources. Then, a possible value of is close to (the speed of sound is )

EASY

EASY

EASY
(Acceleration due to gravity )

MEDIUM

EASY

EASY

EASY

HARD

EASY
(velocity of sound

MEDIUM

MEDIUM

MEDIUM

