1
AIPMT 2003
+4
-1
Out of Syllabus
An observer moves towards a stationary source of sound with a speed 1/5th of the speed of sound. The wavelength and frequency of the source emitted are $$\lambda$$ and $$f$$ respectively. The apparent frequency and wavelength recorded by the observer are respectively
A
1.2 $$f$$,   1.2 $$\lambda$$
B
1.2 $$f$$,  $$\lambda$$
C
$$f$$,  1.2 $$\lambda$$
D
0.8 $$f$$,   0.8 $$\lambda$$
2
AIPMT 2002
+4
-1
Out of Syllabus
A whistle revolves in a circle with angular speed $$\omega$$ = 20 rad/s using a string of length 50 cm. If the frequency of sound from the whistle is 385 Hz, then what is the minimum frequency heard by an observer which is far away from the centre (velocity of sound $$=$$ 340 m/s)
A
385 Hz
B
374 Hz
C
394 Hz
D
333 Hz.
3
AIPMT 2002
+4
-1
A wave travelling in positive X-direction with a $$=$$ 0.2 ms$$-$$2, velocity = 360 ms$$-$$1 and $$\lambda$$ $$=$$ 60 m, then correct expression for the wave is
A
$$y = 0.2\sin \left[ {2\pi \left( {6t + {x \over {60}}} \right)} \right]$$
B
$$y = 0.2\sin \left[ {\pi \left( {6t + {x \over {60}}} \right)} \right]$$
C
$$y = 0.2\sin \left[ {2\pi \left( {6t - {x \over {60}}} \right)} \right]$$
D
$$y = 0.2\sin \left[ {\pi \left( {6t - {x \over {60}}} \right)} \right]$$
4
AIPMT 2001
+4
-1
Two waves having equation x1 = $$a$$sin($$\omega$$t $$-$$ kx + $$\phi$$1), x2 = asin($$\omega$$t $$-$$kx + $$\phi$$2). If in the resultant wave the frequency and amplitude remain equal to amplitude of superimposing waves, the phase difference between them is
A
$${\pi \over 6}$$
B
$${{2\pi } \over 3}$$
C
$${\pi \over 4}$$
D
$${\pi \over 3}$$
EXAM MAP
Medical
NEET