1
JEE Main 2019 (Online) 12th April Morning Slot
+4
-1
A progressive wave travelling along the positive x-direction is represented by y(x,t) = Asin(kx – $$\omega$$t + $$\phi$$). Its snapshot at t = 0 is given in the figure.
For this wave, the phase $$\phi$$ is :
A
$${\pi \over 2}$$
B
$$\pi$$
C
0
D
$$- {\pi \over 2}$$
2
JEE Main 2019 (Online) 12th April Morning Slot
+4
-1
A submarine (A) travelling at 18 km/hr is being chased along the line of its velocity by another submarine (B) travelling at 27 km/hr. B sends a sonar signal of 500 Hz to detect A and receives a reflected sound of frequency $$\upsilon$$. The value of $$\upsilon$$ is close to: (Speed of sound in water =1500 ms–1)
A
507 Hz
B
502 Hz
C
499 Hz
D
504 Hz
3
JEE Main 2019 (Online) 10th April Evening Slot
+4
-1
The correct figure that shows, schematically, the wave pattern produced by superposition of two waves of frequencies 9 Hz and 11 Hz, is :
A
B
C
D
4
JEE Main 2019 (Online) 10th April Evening Slot
+4
-1
A source of sound S is moving with a velocity of 50 m/s towards a stationary observer. The observer measures the frequency of the source as 1000 Hz. What will be the apparent frequency of the source when it is moving away from the observer after crossing him? (Take velocity of sound in air is 350 m/s)
A
750 Hz
B
857 Hz
C
807 Hz
D
1143 Hz
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