P4. Waves

Question 1

What is a wave?

Answer 1

A wave is an oscillation that transfers energy

Question 2

What is the difference between an electromagnetic wave and a mechanical wave?

Answer 2

A mechanical wave needs matter to travel through

Question 3

What type of wave is a sound wave?

Answer 3

Longitudinal

Question 4

How would you describe a longitudinal waves movement?

Answer 4

Vibration of air molecules is in the same direction as the wave, forward and backwards

Question 5

What is the direction of a transverse wave?

Answer 5

Vibration is at right angles of the direction of the wave

Question 6

What does amplitude mean?

Answer 6

Distance from middle to the top/crest or distance from the middle to the bottom/trough

Question 7

What does wave length mean?

Answer 7

Distance from one point on a wave to the same point on another wave ( measured in meters)

Question 8

What does frequency mean?

Answer 8

Number of waves or oscillations per second ( measured in hertz Hz )

Question 9

What type of wave are electromagnetic waves?

Answer 9

Transverse

Question 10

What speed do electromagnetic waves travel at?

Answer 10

300,000,000 metres per second ( in a vacuum )

Question 11

What is a vacuum

Answer 11

A volume which contains no matter

Question 12

What are the 7 types of electromagnetic waves?

Answer 12

Radio, Microwave, Infrared, Visible light, Ultra violet, X-rays, Gamma Rays

Question 13

What is the order for the waves?

Answer 13

Radio, Microwave, Infrared, Visible, Ultra violet, X-rays, Gamma

Question 14

Which has the longest wavelength?

Answer 14

Radio

Question 15

Which has the shortest wavelength?

Answer 15

Gamma Rays

Question 16

Which has the lowest frequency and energy?

Answer 16

Radio

Question 17

Which has the highest frequency and energy?

Answer 17

Gamma

Question 18

Which colour has the highest lowest frequency?

Answer 18

Red

Question 19

Which colour has the highest frequency?

Answer 19

Violet

Question 20

What is an electromagnetic wave?

Answer 20

Oscillating electric and magnetic fields

Question 21

How do you know electromagnetic waves are transverse?

Answer 21

They oscillate at 90 degrees to the direction of the wave

Question 22

What do electromagnetic waves transfer energy to?

Answer 22

An absorber

Question 23

What is the use of UV, X-Ray and Gamma rays ( different )

Answer 23

UV - Kills bacteria in water
X-Ray - Kills skin cancer cells
Gamma - Kills cancer cells and bacteria on food

Question 24

But what are some drawbacks of: UV, XRay and Gamma

Answer 24

UV - can damage DNA in skin
XRAY - Damage cells and cause cancer
Gamma - Damage or kill cells in body