# CP4/5- Waves And The Electromagnetic Spectrum Flashcards Preview

## Combined Science Edexcel Physics > CP4/5- Waves And The Electromagnetic Spectrum > Flashcards

Flashcards in CP4/5- Waves And The Electromagnetic Spectrum Deck (22)
1
Q

What do waves do?

A

Transfer energy and information without transferring matter

2
Q

What is frequency?

A

The number of waves passing a point each second, measured in Hertz

3
Q

What is period?

A

The time taken for one wavelength to pass a point. 1/frequency

4
Q

What are the similarities between longitudinal and traverse waves?

A

They both transfer energy without transferring matter, both have an amplitude, speed, wavelength and frequency

5
Q

What are the differences between longitudinal and traverse waves?

A

Particles in longitudinal waves vibrate along the direction of movement whereas particles in traverse waves move at 90 degrees to the direction of travel

6
Q

Wave speed equation?

A

Frequency x wavelength

7
Q

Distance equation?

A

Wave speed x time

8
Q

What are the properties of electromagnetic waves?

A

All are transverse, all travel at 3 x 10^8 in a vacuum, all transfer energy to the observer

9
Q

What is the order of the electromagnetic spectrum?

A

Radio waves, microwaves, infrared, visible light, ultraviolet, x-ray, gamma rays

10
Q

What has the longest wavelength?

A

11
Q

What has the highest frequency?

A

Gamma rays

12
Q

What are the uses of radio waves?

A

13
Q

What are the uses of microwaves?

A

In mobile phones to communicate by satellite transmission, for cooking

14
Q

What are the dangers of microwaves?

A

They heat water, so they can heat the water in your body

15
Q

What are the uses of infrared?

A

Cooking, thermal images, TV controls where the signal only travels short distances

16
Q

What are the dangers of infrared?

A

It transfers thermal energy and too much can cause skin burn

17
Q

What are the uses of visible light?

A

Allows us to see, illumination, photography

18
Q

What are the uses of ultraviolet?

A

To detect security marks, to detect forged bank notes, to disinfect water

19
Q

What are the dangers of ultraviolet?

A

UV in sunlight can damage skin cells causing sunburn, overtime exposure can cause skin cancer, it can damage cells

20
Q

What are the uses of x-rays?

A

To look inside objects

21
Q

What are the uses of gamma rays?

A

To sterilise food and medical equipment, in scanners to detect cancer, to help treat cancer

22
Q

What are the dangers of gamma and x-rays?

A

They can cause mutation to the DNA cells in the body, this may kill cells or cause cancer