1
JEE Main 2019 (Online) 12th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A small speaker delivers 2 W of audio output. At what distance from the speaker will one detect 120 dB intensity sound ? [Given reference intensity of sound as 10–12 W/m2 ]
A
20 cm
B
10 cm
C
40 cm
D
30 cm
2
JEE Main 2019 (Online) 12th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
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. JEE Main 2019 (Online) 12th April Morning Slot Physics - Waves Question 82 English
For this wave, the phase $$\phi $$ is :
A
$${\pi \over 2}$$
B
$$\pi $$
C
0
D
$$ - {\pi \over 2}$$
3
JEE Main 2019 (Online) 12th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
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
4
JEE Main 2019 (Online) 10th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
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 84 English Option 1
B
JEE Main 2019 (Online) 10th April Evening Slot Physics - Waves Question 84 English Option 2
C
JEE Main 2019 (Online) 10th April Evening Slot Physics - Waves Question 84 English Option 3
D
JEE Main 2019 (Online) 10th April Evening Slot Physics - Waves Question 84 English Option 4
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