P12 - Electromagnetic Waves

Question 1

What are Electromagnetic Waves?

Answer 1

Transverse waves that transfer energy from the source of the waves to an absorber.

Question 2

What order do the waves come in the Electromagnetic Spectrum?

Answer 2

1) Radio Waves
2) Microwaves
3) Infared Radiation
4) Visible Light
5) Ultraviolet
6) X-rays
7) Gamma Rays

Question 3

What is colour spectrum on Visible Light?

Answer 3

Red to Violet

Question 4

What wave has the Longest Wavelength and the Lowest Frequency?

Answer 4

Radio Waves

Question 5

What wave has the Shortest Wavelength and the Highest Frequency?

Answer 5

Gamma Rays

Question 6

What has a shorter wavelength Visible Light or Infared Radiation?

Answer 6

Visible Light

Question 7

What has the Lowest Frequency Ultraviolet or X-rays?

Answer 7

Ultraviolet

Question 8

What is the only Electromagnetic Wave can our eyes detect?

Answer 8

Visible Light

Question 9

How are the waves grouped in the Electromagnetic Spectrum?

Answer 9

Wavelength and Frequency

Question 10

What velocity do electromagnetic waves travel at?

Answer 10

The same velocity through a vacuum (space) or air.

Question 11

What practical applications are radio waves used for?

Answer 11

Television and Radio

Question 12

What practical applications are microwaves used for?

Answer 12

Satellite communications and Cooking Food

Question 13

What practical applications are infared used for?

Answer 13

Infared Cameras and Cooking Food

Question 14

What practical applications are Visible Light used for?

Answer 14

Fibre Optic Communications

Question 15

What practical applications are Ultraviolet used for?

Answer 15

Sun Tanning and Energy Efficient Lamps

Question 16

What practical applications are X-rays used for?

Answer 16

1) Airport Security

2) Medical X-Rays and CT Scan

Question 17

What practical applications are Gamma Rays used for?

Answer 17

1) Sterilisation of Medical Equipment

2) Cancer Therapy (Radio Therapy).

Question 18

What is the Wave Speed Equation?

Answer 18

Wave Speed (m/s) = Frequency (Hz) x Wavelength (m)

Question 19

What are the Dangers of Radio Waves?

Answer 19

No known Dangers

Question 20

What are the dangers of Microwaves?

Answer 20

Can penertrate the body and heat internal organs.

Question 21

What are the dangers of Infared Radiation:

Answer 21

It can damage, burn or kill skin cells (heats up cells).

Question 22

What are the dangers of Visible Light?

Answer 22

Can damage your eyes.

Question 23

What are the dangers of Ultraviolet?

Answer 23

Sun Burn, can lead to skin cancer and damages eyes.

Question 24

What are the dangers of X-rays?

Answer 24

• Can cause cancer, as it MUTATES DNA.

- Kills Cells

Question 25

What are the dangers of Gamma-Rays?

Answer 25

Tissue Damage and Kill Cells

Question 26

What wave is associated with Heat?

Answer 26

Infared Radiation

Question 27

A siren emits a note which has a frequency of 430 Hz and a wavelength of 0.8 m. What is the speed of this sound?

Answer 27

Wave Speed = 430 x 0.8 | = 344 m/s

Question 28

What is the wavelength of a sound wave with frequency 100 Hz and Wave Speed of 344 m/s?

Answer 28

Wave Length = Wave Speed / Frequency Wave Length = 344 / 100 = 3.44 m

Question 29

What sort of Radiation is X-rays and Gamma Rays and what does that mean?

Answer 29

Ionising radiation, which causes the mutation of genes (DNA) and cancer.

Question 30

What does Radiation Dose mean?

Answer 30

Is a measure of the risk of harm resulting from an exposure of the body to the radiation.

Question 31

What Unit is measured for Radiation Dose?

Answer 31

Sievert (1 seivert = 1000 millisieverts)

Question 32

Where do Gamma Rays originate from?

Answer 32

Changes in the nucleus of an atom.

Question 33

If one can has a Matte Black outside surface and the other a Shiny Aluminium surface which will gain heat easiest?

Answer 33

The matte black surface will due to fact that black and matte are better absorber unlike the shiny aluminium surface which which reflect the heat.

Question 34

How can radio waves be produced?

Answer 34

By oscillations in electrical circuits.

Question 35

How do radio waves travel far distances?

Answer 35

When radio waves are absorbed they may create an alternating current with the same frequency as the radio wave itself, so radio waves can themselves include oscillations in a electric circuit.

Question 36

What waves are used for Nuclear Weapons?

Answer 36

Gamma Rays

Question 37

What do changes in the atoms and the nuclei of atoms have on electromagnetic waves?

Answer 37

Being generated or absorbed over a wide frequency range (very destructive).