1
WB JEE 2008
+1
-0.25

Two turning forks of frequencies n1 and n2 produces n beats per second. If n2 and n are known, n1 may be given by

A
$${{{n_2}} \over n} + {n_2}$$
B
$${n_2}n$$
C
$${n_2}\, \pm \,n$$
D
$${{{n_2}} \over n} - {n_2}$$
2
WB JEE 2008
+1
-0.25

A car moving with a velocity of 36 km/hr crosses a siren of frequency 500 Hz. The apparent frequency of siren after passing it will be

A
520 Hz
B
485 Hz
C
540 Hz
D
460 Hz
3
WB JEE 2023
+1
-0.25

The displacement of a plane progressive wave in a medium, travelling towards positive x-axis with velocity 4 m/s at t = 0 is given by $$y = 3\sin 2\pi \left( { - {x \over 3}} \right)$$. Then the expression for the displacement at a later time t = 4 sec will be

A
$$y = 3\sin 2\pi \left( { - {x-16 \over 3}} \right)$$
B
$$y = 3\sin 2\pi \left( { {-x-16 \over 3}} \right)$$
C
$$y = 3\sin 2\pi \left( { {-x+1 \over 3}} \right)$$
D
$$y = 3\sin 2\pi \left( { {-x-1 \over 3}} \right)$$
WB JEE Subjects
Physics
Mechanics
Electricity
Optics
Modern Physics
Chemistry
Physical Chemistry
Inorganic Chemistry
Organic Chemistry
Mathematics
Algebra
Trigonometry
Coordinate Geometry
Calculus
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