1
JEE Main 2021 (Online) 24th February Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Which of the following equations represents a travelling wave?
A
y = Aexcos($$\omega$$t $$-$$ $$\theta$$)
B
y = Ae$$-$$x2(vt + $$\theta$$)
C
y = A sin (15x $$-$$ 2t)
D
y = A sinx cos$$\omega$$t
2
JEE Main 2020 (Online) 6th September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
A sound source S is moving along a straight track with speed v, and is emitting, sound of frequency v0 (see figure). An observer is standing at a finite distance, at the point O, from the track. The time variation of frequency heard by the observer is best represented by:
(t0 represents the instant when the distance between the source and observer is minimum)
A
JEE Main 2020 (Online) 6th September Morning Slot Physics - Waves Question 63 English Option 1
B
JEE Main 2020 (Online) 6th September Morning Slot Physics - Waves Question 63 English Option 2
C
JEE Main 2020 (Online) 6th September Morning Slot Physics - Waves Question 63 English Option 3
D
JEE Main 2020 (Online) 6th September Morning Slot Physics - Waves Question 63 English Option 4
3
JEE Main 2020 (Online) 5th September Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
A driver in a car, approaching a vertical wall notices that the frequency of his car horn, has changed from 440 Hz to 480 Hz, when it gets reflected from the wall. If the speed of sound in air is 345 m/s, then the speed of the car is :
A
36 km/hr
B
54 km/hr
C
24 km/hr
D
18 km/hr
4
JEE Main 2020 (Online) 5th September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Assume that the displacement(s) of air is proportional to the pressure difference ($$\Delta $$p) created by a sound wave. Displacement (s) further depends on the speed of sound (v), density of air ($$\rho $$) and the frequency (f). If $$\Delta $$p ~ 10 Pa, v ~ 300 m/s, $$\rho $$ ~ 1 kg/m3 and f ~ 1000 Hz, then s will be of the order of (take the multiplicative constant to be 1) :
A
1 mm
B
$${3 \over {100}}$$ mm
C
10 mm
D
$${1 \over {10}}$$ mm
JEE Main Subjects
EXAM MAP
Medical
NEET
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
Civil Services
UPSC Civil Service
CBSE
Class 12