Acadeca Science Section 4: Electromagnetic Waves

One of the next great unifications after Newtons laws of motion were created by…

James Clerk Maxwell

What are electromagnetic waves created by?

oscillating electric and magnetic fields

Oscillating at 400 trillion times per second, what color?

Red

Oscillating at 500 trillion times per second, what color?

Yellow

Oscillating at 600 trillion times per second, what color?

Green

Oscillating at 700 trillion times per second, what color?

Blue

What did Maxwell discover is an electromagnetic wave

Light

Wave

the transference of energy through a substance without any of the substance being transported

When a wave moves back in forth in the same direction as the wave, what type of wave is it

A longitudinal wave

Example of a longitudinal wave

SoundWhen

When a wave vibrates perpendicular to the wave

transverse wave

Wavelength

The horizontal length between any 2 points in a repeating cycle of a wave

Amplitude (In general)

The intensity of a wave

What is wave frequency and what is it measured in

How many full wavelengths pass through a given point per second. Hertz (Hz)

The speed of sound in air is typically

300 meters per second

The speed of light

300 million meters per second

Sound

Wave the passes through a substance

A high frequency wave has

short wavelength

A low frequency wave has

a long wavelength

Wavelengths of the visible spectrum range from

400 nanometers to 700 nanometers

If we go longer in wavelength and a lower frequency than red, we have…

Infrared 

We can feel infrared as

heat

What 2 types of waves are used in long distance communication

Radio waves, Microwaves

Dangerous radiation is at the end of the spectrum, has…frequency and…wavelength and starts with…

higher, lower, ultraviolet

UV radiation is most commonly associated with

sunburns

The higher the…the more…waves tend to carry

frequency, energy

Beyond UV we have…,discovered by…

X-Ray, Wilhem Rontgen

…Rays have the…wavelength and the longest…

Gamma, shortest,longest

What do Gamma rays come from

Atomic nuclei going under radioactive decay

What inspired who to do what

Maxwells Equations, Heinrich Hertz, send a wireless signal

In 1901, who sent the first wireless signal across the atlantic

Guglielmo Marconi

The first 2 way wireless conversation happened between who

Theodore Roosevelt and King Edward

Electromagnetic waves mediums allow us to

See the stars and communicate with satalites

Where was one of the biggest telescopes built and what is its name

Puerto Rico, Arecibo

Arecibo sent what to where

A message about humanity to the star cluster Messier 13

What is radiation from the birth of earth called

Cosmic Microwave Background

The James Webb telescope allows us to look at

Infrared radiation in vast nebulae

Radio frequencies are measured in

megaHertz

Humans make and can hear

kiloHertz

What is the main thing used in a radio for AM

An RHC circuit

The audio that comes out a TV is transmitted through

FM

The video that comes from a TV is transmitted through

AM

The earliest TV used a

Cathode ray tube

Cathode

A collection of negative charges

Anode

A collection of positive charges

Most TV’s today use what instead of CRT’s

Liquid Crystal Displays (LCD)

What do both LED’s and Solar panels use

Semiconductors

You will always measure the speed of light as c, relative to

you

The title of Einsteins paper about his theory of relativity was called

On The Electrodynamics of moving bodies

The true fundamental force is

the electromagnetic force

Length contraction

a phenomenon where an object moving at a high speed appears shorter to stationary observers in the direction of its motion