JEE Main 2021 (Online) 25th February Morning Shift | Waves Question 44 | Physics

JEE Main 2021 (Online) 25th February Morning Shift

MCQ (Single Correct Answer)

-1

A student is performing the experiment of resonance column. The diameter of the column tube is 6 cm. The frequency of the tuning fork is 504 Hz. Speed of the sound at the given temperature is 336 m/s. The zero of the metre scale coincides with the top end of the resonance column tube. The reading of the water level in the column when the first resonance occurs is :

13 cm

18.4 cm

16.6 cm

14.8 cm

JEE Main 2021 (Online) 24th February Evening Shift

MCQ (Single Correct Answer)

-1

Which of the following equations represents a travelling wave?

y = Ae^xcos($$\omega$$t $$-$$ $$\theta$$)

y = Ae^$$-$$x²(vt + $$\theta$$)

y = A sin (15x $$-$$ 2t)

y = A sinx cos$$\omega$$t

JEE Main 2021 (Online) 24th February Morning Shift

MCQ (Single Correct Answer)

-1

In the given figure, a mass M is attached to a horizontal spring which is fixed on one side to a rigid support. The spring constant of the spring is k. The mass oscillates on a frictionless surface with time period T and amplitude A. When the mass is in equilibrium position, as shown in the figure, another mass m is gently fixed upon it. The new amplitude of oscillations will be :

JEE Main 2021 (Online) 24th February Morning Shift Physics - Waves Question 47 English

JEE Main 2021 (Online) 24th February Morning Shift Physics - Waves Question 47 English

$$A\sqrt {{M \over {M - m}}} $$

$$A\sqrt {{{M - m} \over M}} $$

$$A\sqrt {{{M + m} \over M}} $$

$$A\sqrt {{M \over {M + m}}} $$

JEE Main 2020 (Online) 6th September Morning Slot

MCQ (Single Correct Answer)

-1

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)