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(II) A 524 -Hz longitudinal wave in air has a speed of 345 $\mathrm{m} / \mathrm{s}$ . (a) What is the wavelength? (b) How much time is required for the phase to change by $90^{\circ}$ at a given point inspace? (c) At a particular instant, what is the phase difference (in degrees) between two points 4.4 $\mathrm{cm}$ apart?

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a) 0.658b) $4.77 \times 10^{-4} s$c) $24.1^{\circ}$

Physics 101 Mechanics

Physics 102 Electricity and Magnetism

Chapter 15

Wave Motion

Periodic Motion

Mechanical Waves

Electromagnetic Waves

Simon Fraser University

Hope College

University of Winnipeg

McMaster University

Lectures

03:40

In physics, electromagnetic radiation (EM radiation or EMR) refers to the waves (or their quanta, photons) of the electromagnetic field, propagating (radiating) through space, carrying electromagnetic radiant energy. It includes radio waves, microwaves, infrared, (visible) light, ultraviolet, X-rays, and gamma rays. Electromagnetic waves of different frequency are called by different names since they have different sources and effects on matter. In order of increasing frequency and decreasing wavelength these are: radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays and gamma rays.

10:59

In physics, Maxwell's equations are a set of partial differential equations that, together with the Lorentz force law, form the foundation of classical electromagnetism, classical optics, and electric circuits. They underpin all electric, optical and radio such electromagnetic technologies as power generation, electric motors, wireless communication, cameras, televisions, computers, and radar. Maxwell's equations describe how electric and magnetic fields are generated by charges, currents, and changes of these fields. The equations have two major variants. The microscopic Maxwell equations have universal applicability but are unwieldy for common calculations. They relate the electric and magnetic fields to total charge and total current, including the complicated charges and currents in materials at the atomic scale. The macroscopic Maxwell equations define two new auxiliary fields that describe the large-scale behaviour of matter without having to consider atomic scale details. The equations were published by Maxwell in his 1864 paper "A Dynamical Theory of the Electromagnetic Field". In the original paper Maxwell fully derived them from the Lorentz force law (without using the Lorentz transformation) and also from the conservation of energy and momentum.

05:25

A transverse wave of frequ…

03:05

A sinusoidal wave of frequ…

02:29

35.20. Coherent sources $A…

03:10

A wave of frequency $500 \…

01:35

A wave of frequency $20 \m…

01:29

The wave velocity of a tra…

Coherent sources $A$ and $…

05:23

(II) A transverse travelin…

05:59

Find the (a) amplitude, (b…

05:16

Two harmonic waves travel …

02:40

$\bullet$ A certain transv…

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