Electromagnetic Waves Overview

<p>It can lead to skin cancer. (B)</p> Signup and view all the answers

<p>Broadcasting television signals (D)</p> Signup and view all the answers

<p>Their small wavelength. (B)</p> Signup and view all the answers

<p>Visible light - Remote sensing (D)</p> Signup and view all the answers

<p>It kills germs and microorganisms. (C)</p> Signup and view all the answers

<p>Electromagnetic waves can exist due to time-varying electric and magnetic fields. (B)</p> Signup and view all the answers

<p>The charge must be accelerating. (A)</p> Signup and view all the answers

<p>They oscillate perpendicular to each other and to the direction of wave propagation. (B)</p> Signup and view all the answers

<p>Heinrich Hertz (B)</p> Signup and view all the answers

<p>The energy comes from the oscillating charge that generates it. (B)</p> Signup and view all the answers

<p>The frequency of oscillation of the generating charge. (D)</p> Signup and view all the answers

<p>It creates an alternating electric field that regenerates a magnetic field. (D)</p> Signup and view all the answers

<p>Perpendicular to each other. (A)</p> Signup and view all the answers

<p>$\frac{E_0}{B_0} = c$ (A)</p> Signup and view all the answers

<p>The wave number, given by $k = \frac{2π}{λ}$ (C)</p> Signup and view all the answers

<p>They all travel at the same speed, $c = 3 × 10^8 m/s$. (A)</p> Signup and view all the answers

<p>Transverse wave (B)</p> Signup and view all the answers

<p>They are not deflected. (D)</p> Signup and view all the answers

<p>$v = λν$ (D)</p> Signup and view all the answers

<p>It is shared equally between the electric and magnetic fields. (C)</p> Signup and view all the answers

<p>The force exerted by waves when they interact with surfaces. (D)</p> Signup and view all the answers

<p>c = √(µ0 ε0) (C)</p> Signup and view all the answers

<p>u = 2ε0 E0^2 (C)</p> Signup and view all the answers

<p>n = c / v (C), n = √(µr εr) (D)</p> Signup and view all the answers

<p>p = U/c (D)</p> Signup and view all the answers

<p>I = U / (Area x time) (D)</p> Signup and view all the answers

<p>p = U/c (A)</p> Signup and view all the answers

<p>Pr = I/c (B)</p> Signup and view all the answers

<p>u = uE + uB (A)</p> Signup and view all the answers

The relationship shows c² = µ₀ε₀, where c is the speed of light.

v = c / √(µᵣ εᵣ) indicates speed in other materials compared to vacuum.

n = √(µᵣ εᵣ), it describes how light bends in different media.

Average energy density, u = 2ε₀E₀², shared equally by electric and magnetic fields.

Momentum p = U/c, where U is total energy carried by wave.

Intensity I = Energy/(Area x time) = u * c, energy over area per time.

Pressure exerted by EM wave on a surface, resulting from momentum transfer.

EM waves transfer energy and momentum to charges in motion.

Electric and magnetic fields are perpendicular to each other and the wave direction.

E0 and B0 represent the amplitudes of electric and magnetic fields respectively.

k = 2π/λ relates to the wavelength of an EM wave.

All EM waves travel at speed c = 3 x 10^8 m/s in a vacuum.

EM waves are transverse; fields oscillate perpendicular to propagation direction.

Electric and magnetic field oscillations in an EM wave are in the same phase.

EM waves carry energy equally shared by electric and magnetic fields.

EM waves exert pressure known as radiation pressure as they travel.

The orderly distribution of EM waves by wavelength or frequency.

Waves used in cooking, communication, and radar systems.

Cooks food by vibrating water molecules at resonant frequency.

Waves that produce heat and are used in remote sensing.

The portion of the spectrum that allows us to see the world.

EM waves used for sterilization and harmful to skin.

Used in radio broadcasting and astronomy.

Better for long-range due to minimal bending by objects.

Waves radiated by accelerating charges, propagating through electric and magnetic fields.

Maxwell theorized electromagnetic waves exist due to oscillating electric and magnetic fields.

A changing magnetic field creates a changing electric field.

A charge that accelerates back and forth, producing EM waves.

The first experimental proof of electromagnetic waves by Heinrich Hertz.

Bose created EM waves; Marconi transmitted them over distances.

EM waves have oscillating electric and magnetic fields perpendicular to each other and the propagation direction.

The frequency of the EM wave equals the frequency of the oscillation of the charge.