NCERT Solutions for class 11 Physics Chapter 14: Oscillations

NCERT Solutions for Class 11 Physics Chapter 14: Oscillations deals with concepts of oscillatory motion. Oscillation is a time-dependent measure of some recurrent variation. Oscillation can be referred to as a body that is in constant motion also known as oscillatory motion when the body moves in a to and fro motion around the same point at a uniform interval of time.

Class 11 Physics Chapter 14 Oscillations belongs to Unit 10 Oscillations and Waves which has a weightage of 10 marks in the CBSE Class 11 Physics Examination. The chapter deals with simple harmonic motion and uniform circular motion.

Download PDF: NCERT Solutions for Class 11 Physics Chapter 14

NCERT Solutions for Class 11 Physics Chapter 14

Class 11 Physics NCERT Solutions for Chapter 14 Oscillations are as given below –

Class 11 Physics Chapter 14 – Concepts Covered

Oscillations are regular variations in magnitude or position about a central point, especially of a voltage or an electric current.

It is the back and forth movement in a regular rhythm. For example, the pendulum of a clock, in a swing, etc.

Periodic Motion is a periodically repeating motion that is a function of time.

- Time Period refers to the period of time after which the motion repeats itself.

- Frequency is the number of repetitions per unit of time (v = 1/T).

Oscillatory Motions is the to and fro, and then back motion. It can be seen in both non-periodic and periodic motion.

Oscillatory motions operate upon a restoring force or torque that directs its motion towards the equilibrium position.

Simple Harmonic Motions are oscillations where the restoring force is directly proportional to the displacement from the mean position, therefore creating a fixed set of motion.

Three primary conditions that are required for a simple harmonic motion are-

A position where there is a stable equilibrium that results from a zero potential energy.
The energy is conserved, i.e., ther is no dissipation of energy.
The acceleration is proportional to the displacement.

A simple pendulum is a common example of bodies showing simple harmonic motion. An ideal pendulum consists of a heavy point mass body that is suspended by a weightless inextensible and perfectly flexible string from rigid support about which the body is free to oscillate.

The time period of a simple pendulum of length ‘l’ is –

$T = 2 \pi \sqrt {l \over g}$

Class 11 Physics Chapter 14 Related Guides –

Free, Forced, and Damped Oscillations	Transverse and longitudinal waves	Beats
Doppler effect	Longitudinal Waves	Transverse Waves
Unit of Wavelength	Laplace Correction	Wave Motion

Class 11 Physics Study Guides:

Physics Constants	SI Units in Physics	Physics Study Notes
Difference between in Physics	Relation between articles in Physics	Physics Formula
Derivations in Physics	NCERT Solutions for Class 11 Physics	Class 11 Physics Notes

CBSE CLASS XII Related Questions

1.
A parallel beam of monochromatic light falls normally on a single slit of width $a$ and a diffraction pattern is observed on a screen placed at distance $D$ from the slit. Explain:
(I) the formation of maxima and minima in the diffraction pattern, and
(II) why the maxima go on becoming weaker and weaker with its increasing number $n$.
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2.
A rectangular loop of size 5 cm $\times$ 8 cm is lying in the $x$-$y$ plane in a uniform magnetic field $\vec{B} = (2.0\ \text{T})\hat{k}$. The total magnetic flux linked with the loop is:
- 80 Wb
- 16 Wb
- $8 \times 10^{-2}$ Wb
- $8 \times 10^{-3}$ Wb
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3.
A square loop of side 0.50 m is placed in a uniform magnetic field of 0.4 T perpendicular to the plane of the loop. The loop is rotated through an angle of $60^\circ$ in 0.2 s. The value of emf induced in the loop will be:
- 5 V
- 3.5 V
- 2.5 V
- Zero V
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4.
A wire of length $L$ is bent round into (i) a square coil having $N$ turns and (ii) a circular coil having $N$ turns. The coil in both cases is free to turn about a vertical axis coinciding with the plane of the coil, in a uniform, horizontal magnetic field and carry the same currents. Find the ratio of the maximum value of the torque acting on the square coil to that on the circular coil.
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5.
In a region, the electric potential varies as $V = 10 - 50x$, where $V$ is in volts and $x$ is in meters. The electric field in the region is
- $10\ \text{N/C}$ along $+x$
- $10\ \text{N/C}$ along $-x$
- $50\ \text{N/C}$ along $+x$
- $50\ \text{N/C}$ along $-x$
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6.
Consider the nuclear reaction $ X \to Y + Z $. Let $ M_x $, $ M_y $, and $ M_z $ be the masses of the three nuclei X, Y, and Z respectively. Then which of the following relations hold true?
- $ (M_x - M_z)<M_y $
- $ (M_x - M_y)<M_z $
- $ M_x>(M_y + M_z) $
- $ M_x<(M_y + M_z) $
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