Physics-
General
Easy
Question
Vibrating tuning fork of frequency 
is placed near the open end of a long cylindrical tube. The tube has a side opening and is fitted with a movable reflecting piston. As the piston is moved through 
the intensity of sound changes from a maximum to minimum. If the speed of sound is 
then is
The correct answer is:
When the piston is moved through a distance of 
the path difference produced is 
This must be equal to 
for maximum to change to minimum.
So, 
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, 
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tan 
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Two blocks A and B of equal masses m kg each are connected by a light thread, which passes over a massless pulley as shown in the figure. Both the blocks lie on wedge of mass m kg. Assume friction to be absent everywhere and both the blocks to be always in contact with the wedge. The wedge lying over smooth horizontal surface is pulled towards right with constant acceleration a ( ). (g is acceleration due to gravity) Normal reaction (in N) acting on block B is
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physics-General
