Electromagnetic waves

Question 1

What are the 7 characteristics all EM waves have

Answer 1

1. They can al travel through a vacumn
2. possess both a magnetic wave and an electrical wave interlocked and at right angles to each other
3. speed of light travel in space
4. transverse waves
5. can be reflected, refracted, diffracted
6. demonstrate interference
7. can be polarised

Question 2

acronym for all EM waves

Answer 2

Riding my imaginary van, Uncle Xavier giggled

Question 3

How does wavelength vary as you go from radio to gamma rays

How does frequency vary as you go from radio to gamma rays

How does danger vary as you go from radio to gamma

Answer 3

As you go from radio to gamma, the frequency increases

As you go from radio to gamma, the wavelength decreases.

As you go from radio to gamma the danger increases

Radio high wavelength
Gamma high frequency

Question 4

What is the range of wavelength from radio to gamma

Answer 4

10^-1 TO 10^-16

highest wavelength to lowest

radio to gamma

Question 5

What is the range of frequency from radio to gamma

Answer 5

3x10^4 TO 3x10^24

Question 6

how are radio waves produced, method of detection and uses

Answer 6

accelerated charges

antennas

for communication

Question 7

how are microwaves waves produced, metod of detection, and uses

Answer 7

magnetron oscillators using electrons to set up oscillations in a cavity

electronic circuit detects

radar, ovens, satelite, phones

Question 8

how are infra-red waves produced, metod of detection, and uses

Answer 8

oscillations of molecules, from all objects at any positive temperature

photographic film

night vision

Question 9

how are visible light waves produced, metod of detection, and uses

Answer 9

from high temperature solids and gases, lasers

retina of eye

sight communication

Question 10

how are ultra violet waves produced, metod of detection, and uses

Answer 10

from high temperature solids and gases, lasers

photographic film

counterfeit detection by detergents

Question 11

how are X-Rays waves produced, metod of detection, and uses

Answer 11

Bombarding metals with high energy electrons

photographic film

x rays photography

Question 12

how are Gamma rays waves produced, metod of detection, and uses

Answer 12

nuclear decay

geiger tube

cancer treatment / sterilisation/treat cancer

Question 13

how are gammas rays emmited, compared to x rays

Answer 13

x rays are made by accelerated electrons outside the nucleus
gamma rays are emitted from the nucleus of an atom

Question 14

what are the non ionising EM radiation

Answer 14

radio, microwaves, infrared, visible light.

Question 15

Why are some EM waves non ionising

Answer 15

They do not have enough proton energy to remove electrons from the shells of atoms. So they cant produce ions.

Question 16

What does ionisation lead to, and are the non ionising EM waves safe

Answer 16

Human cell mutation that can cause diseases eg, cancer. So non-ionising are relatively safe

Question 17

how many parts of the UV rays from sun is it often divided into.
And what are those parts, and what they do.

Answer 17

3 parts

UV-A = tanning which is 99% of UV light

UV-B = sunburn and skin cancer

UV-C = filtered out by atmosphere and does not reach surface of earth

Question 18

what is the process of producing X-rays

Answer 18

use electron gun, heat up filament using wire, thermionic emissions to release electrons and they are accelerated towards copper anode and reflected from metal.