TS EAMCET · Physics · Waves and Sound
One end of a string is tied to the ceiling of a lift and a load is attached ai the bottom end of the string. When the lift is moving upwards with an acceleration of \(2.1 \mathrm{~ms}^{-2}\), the speed of the transverse wave at the lower end of the string is \(88 \mathrm{~ms}^{-1}\). If the lift moves downwards with an acceleration of \(1.9 \mathrm{~ms}^{-2}\), the speed of the transverse wave at the lower end of the string is \(\left(\mathrm{g}=10 \mathrm{~ms}^{-2}\right)\)
- A \(88 \mathrm{~ms}^{-1}\)
- B \(102 \mathrm{~ms}^{-1}\)
- C \(119 \mathrm{~ms}^{-1}\)
- D \(72 \mathrm{~ms}^{-1}\)
Answer & Solution
Correct Answer
(D) \(72 \mathrm{~ms}^{-1}\)
Step-by-step Solution
Detailed explanation
When lift is moving upwards then frequency \(\mathrm{n}_{\mathrm{u}}=\frac{1}{2 \pi} \sqrt{\frac{\mathrm{g}+\mathrm{a}}{1}}\) and when moving downwards then frequency \(\mathrm{n}_{\mathrm{d}}=\frac{1}{2 \pi} \sqrt{\frac{\mathrm{g}-\mathrm{a}}{1}}\); wave velocity…
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Physics
- A mental sphere of radius \(r\) and specific heat \(S\) is rotated about an axis passing through its centre at a speed of \(n\) rotations per second. It is suddenly stopped and \(50 \%\) of its energy is used in increasing its temperature. Then, the raise in temperature of the sphere isTS EAMCET 2002 Hard
- A non-conducting solid sphere has radius \(R\) and uniform charge density. A spherical cavity of radius \(\frac{R}{4}\) is hollowed out of the sphere. The distance between center of sphere and center of cavity is \(\frac{R}{2}\). If the charge of the sphere is \(Q\) after the creation of the cavity and the magnitude of electric field at the center of the cavity is \(E=K\left(\frac{Q}{4 \pi \in_0 R^2}\right)\), determined the approximate value of \(K\).TS EAMCET 2019 Hard
- The displacement-time graphs of two moving particles make angles of \(30^{\circ}\) and \(45^{\circ}\) with the time axis. The ratio of their velocities is
TS EAMCET 2023 Medium - The long range force experienced by a neutral particle with a finite massTS EAMCET 2020 Easy
- Two capacitors of capacities \(1 \mu \mathrm{F}\) and \(C \mu \mathrm{F}\) are connected in series and the combination is charged to a potential difference of \(120 \mathrm{~V}\). If the charge on the combination is \(80 \mu \mathrm{C}\), the energy stored in the capacitor of capacity \(C\) in \(\mu \mathrm{J}\) isTS EAMCET 2010 Medium
- About \(20 \%\) of the power of a \(100 \mathrm{~W}\) bulb is converted to visible radiation. Assuming that the radiations is emitted isotropically and neglecting reflection, the average intensity of visible radiation at a distance of \(5 \mathrm{~m}\) is \(\frac{\alpha}{25 \pi} \mathrm{W} / \mathrm{m}^2\). The value of \(\alpha\) isTS EAMCET 2022 Easy
More PYQs from TS EAMCET
- A particle of mass \(1 \mathrm{~kg}\) is projected with an initial velocity \(10 \mathrm{~ms}^{-1}\) at an angle of projection \(45^{\circ}\) with the horizontal. The average torque acting on the projectile, between the time at which it is projected and the time at which it strikes the ground, about the point of projection in newton-metre isTS EAMCET 2004 Medium
- A prism of refractive index \(\mu\) and angle \(A\) is placed in the minimum deviation position. If the angle of minimum deviation is \(A\), then the value of \(A\) in terms of \(\mu\) is :TS EAMCET 2003 Hard
- In the circuit shown below, the ammeter reading is zero. Then the value of the resistance \(R\) is
TS EAMCET 2011 Medium - In a meter bridge two gaps in the metallic strip are connected by \(3 \Omega\) and \(9 \Omega\) resistors. What should be the value of shunt that needs to be added to \(9 \Omega\) resistor to shift balancing point by \(25 \mathrm{~cm}\) ?TS EAMCET 2020 Easy
- The ratio of the energies of the electron in the hydrogen atom in the first and second excited states isTS EAMCET 2023 Medium
- A body of mass \(2 \mathrm{~kg}\) starts from rest and moves with uniform acceleration. It acquires a velocity \(20 \mathrm{~ms}^{-1}\) in \(4 \mathrm{~s}\). The power exerted on the body in \(2 \mathrm{~s}\) in watts isTS EAMCET 2002 Easy