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1
JEE Main 2019 (Online) 10th April Evening Slot
MCQ (Single Correct Answer)
+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
JEE Main 2019 (Online) 10th April Evening Slot Physics - Waves Question 65 English Option 1
B
JEE Main 2019 (Online) 10th April Evening Slot Physics - Waves Question 65 English Option 2
C
JEE Main 2019 (Online) 10th April Evening Slot Physics - Waves Question 65 English Option 3
D
JEE Main 2019 (Online) 10th April Evening Slot Physics - Waves Question 65 English Option 4
2
JEE Main 2019 (Online) 10th April Evening Slot
MCQ (Single Correct Answer)
+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
3
JEE Main 2019 (Online) 10th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
The displacement of a damped harmonic oscillator is given by
x(t ) = e–0.1t cos (10$$\pi $$t + f).
Here t is in seconds. The time taken for its amplitude of vibration to drop to half of its initial value is close to :
A
27 s
B
13 s
C
7 s
D
4 s
4
JEE Main 2019 (Online) 10th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
A stationary source emits sound waves of frequency 500 Hz. Two observers moving along a line passing through the source detect sound to be of frequencies 480 Hz and 530 Hz. Their respective speeds are, in ms–1, (Given speed of sound = 300 m/s)
A
12, 18
B
16, 14
C
12, 16
D
8, 18
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