The Electromagnetic Spectrum Flashcards Preview

Physics > The Electromagnetic Spectrum > Flashcards

Flashcards in The Electromagnetic Spectrum Deck (21):
0

What is the EM spectrum?

Radio waves - longest wavelength, lowest frequency
Microwaves
Infrared
Visible light
Ultraviolet
X-rays
Gamma rays - shortest wavelength, highest frequency

1

What was Herschel's experiment?

Put filters on telescope, noticed that different coloured filters heated telescope to different extents. Used a prism to split sunlight into spectrum, put two thermometers on either side of the spectrum. Found that temp rose with colour change from violet to red. Measured temp just beyond red of spectrum, where there was no visible light, found that this gave highest temp, called it infrared.

2

Describe Ritter's experiment

Used silver chloride, which turns black when exposed to light. Turned black faster in violet light than red light, but turned black fastest when exposed to invisible Rays beyond violet. Ultraviolet rays

3

Are electromagnetic waves transverse or longitudinal?

Transverse, travel at same speed in a vacuum.

4

How does the danger of electromagnetic waves increase?

Higher frequency = more dangerous

5

What are the harmful effects of microwaves?

Internal heating of body cells

6

What are the harmful effects of infrared?

Skin burns

7

What are the harmful effects of ultraviolet?

Damage to surface cells & eyes, leading to skin cancer & eye conditions

8

What are the harmful effects of X-rays and gamma rays?

Mutation or damage to cells in body

9

What are the uses of radio waves?

Broadcasting, communications, satellite transmissions

10

What are the uses of microwaves?

Cooking,communications, satellite transmissions

11

What are the uses of infrared?

Cooking, thermal imaging, short range communications, optical fibres, television remote controls, security systems

12

What are the uses of visible light?

Vision, photography, illumination

13

What are the uses of ultraviolet?

Security marking, fluorescent lamps,mete ting forged bank notes, disinfecting water

14

What are the uses of X-rays?

Observing internal structure of objects, airport security scanners, medical X-rays

15

What are the uses of gamma rays?

Sterilising food and medical equipment, detection of cancer & its treatment

16

How are ionising radiations emitted?

All the time by radioactive sources

17

What does ionising radiation emit?

Alpha and beta particles and gamma rays, they transfer energy

18

What is ionising radiation?

Radiation or certain types of high-energy particles that can cause atoms to become electrically charged (to become ions)

19

What are ionising radiations emitted by?

Radioactive sources all the time

20

What does ionising radiation include?

Alpha & beta particles & gamma rays
They transfer energy