1.1 Introduction
1.1 Oscillations or Vibrations
1.1 Oscillations or Vibrations some important points
1.1 Wave Quantities
1.1 Wave Properties
1.1 Wave Types
1.1 Speed of Waves
1.1 Simple Harmonic Motion
1.1 Derivation of Period and Frequency for SHM
1.1 Energy in Simple Harmonic Motion
1.1 SHM & Simple Pendulum
1.1 Reflection and Transmission
1.1 Summary
Unit 1.1 Multiple Choice Questions - Waves
Unit 1.1 Multiple Choice Answers - Waves

 

Unit 1.1 Summary

— An oscillating (or vibrating) object undergoes simple harmonic motion (SHM) if the restoring force is proportional to (the negative of) the displacement F = –kx.

— The maximum displacement from equilibrium is called the amplitude.

— The period, T, is the time required for one complete cycle (back and forth).

— The frequency, f, is the number of cycles per second. f = 1/T

— The period of oscillation for a mass m on the end of a spring is given by period

— SHM is sinusoidal, which means that the displacement as a function of time follows a sine curve.

— A simple pendulum of length approximates SHM if its amplitude is small and friction can be ignored. For small amplitudes, its period is given by period

— The wavelength of a continuous sinusoidal wave is the distance between two successive crests or any two successive points in phase.

— The frequency is the number of full wavelengths that pass a given point per unit time.

— The amplitude of a wave is the maximum height of a crest, or depth of a trough, relative to the normal (or equilibrium) level.

— The wave speed (how fast a crest moves) is equal to the product of wavelength and frequency. v = fλ

— In a transverse wave, the oscillations are perpendicular to the direction in which the wave travels. An example is a wave on a cord.

— In a longitudinal wave, the oscillations are along (parallel to) the line of travel - sound is an example.

— Waves reflect off objects in their path. When the wave front (of a two- or three-dimensional wave) strikes an object, the angle of reflection is equal to the angle of incidence. This is the law of reflection.

— When a wave strikes a boundary between two materials in which it can travel, part of the wave is reflected and part is transmitted.

 

Concept by Kishore Lal. Programmed by Kishore Lal... Copyright © 2015 Kishore Lal. All rights reserved.