Waves (2)

Question 1

What is wavelength?

Answer 1

The wavelength is the distance between any 2 repeating points in a wave.

Question 2

What is frequency?

Answer 2

Frequency is the number of waves passing a point in one second.

Question 3

What is amplitude?

Answer 3

Amplitude is the height of the wave from the middle line.

Question 4

What is diffraction?

Answer 4

It is when waves bend around an obstacle.

Question 5

What affects how well the wave diffract?

Answer 5

Their wavelength, as waves with a higher wavelength diffract more and waves with a higher frequency diffract less.

Question 6

What dictates how loud a sound is?

Answer 6

Amplitude.

Question 7

How loud is a quiet conversation?

Answer 7

60 decibels.

Question 8

What is the danger level in terms of sound?

Answer 8

80 decibels.

Question 9

What range of frequencies can people hear?

Answer 9

20 to 20,000 hertz.

Question 10

What is ultrasound?

Answer 10

Frequencies above 20,000 hertz.

Question 11

What can ultrasound be used for?

Answer 11

Creating pictures of babies, finding cracks in pipes, finding fish in the sea and breaking up kidney stones.

Question 12

What is the Electromagnetic Spectrum?

Answer 12

It is the range or family of waves which travel as transverse waves.

Question 13

How do transverse waves travel?

Answer 13

Transverse waves vibrate at a right angle in the direction of the wave.

Question 14

What are some examples of transverse waves?

Answer 14

Radio, water and electromagnetic waves.

Question 15

How do longitudinal waves travel?

Answer 15

Longitudinal waves vibrate back and forth in the direction of the wave.

Question 16

What are some examples of longitudinal waves?

Answer 16

Sound, ultrasound and seismic-p waves.

Question 17

How many decibels can damage your hearing?

Answer 17

110 decibels.

Question 18

In what case does frequency increase?

Answer 18

Frequency increases going down the electromagnetic spectrum.

Question 19

In what case does wavelength decrease?

Answer 19

Wavelength decreases going down the electromagnetic spectrum.

Question 20

The electromagnetic spectrum consists of 8 waves, what are they?

Answer 20

Radio, TV, Microwave, Infra-Red Light, Visible Light, Ultraviolet, X-rays, Gamma Rays. (ALM-332 can be used to remember these, Appliances: Radio, TV, Microwave. Light: Infra-Red, Visible Light, Ultraviolet. Medical: X-rays, Gamma Rays.

Question 21

What increases as the frequency of a wave increases?

Answer 21

Energy

Question 22

Why are Radio and TV waves ideal for what they do?

Answer 22

They have long wavelengths meaning they diffract more and are ideal for carrying radio and TV programs.

Question 23

Who proved that radio can be used for long distance communication (in detail).

Answer 23

Marconi proved that radio can be used to communicate information over a long distance using a radio transmission from Britain to America in 1901. (RADAR)

Question 24

What can microwaves also be used to carry?

Answer 24

Waves to satellites.

Question 25

What does RADAR stand for?

Answer 25

RAdio Detection and Ranging.

Question 26

What is the wavelength range of microwave ovens?

Answer 26

1mm to 50mm.

Question 27

What is infra red the scientific name for?

Answer 27

Heat.

Question 28

What can infra red be used for?

Answer 28

Speed up recovery of damaged muscle, drying paint and thermal imaging.

Question 29

What is visible light made up off?

Answer 29

It is made up of a range of different colours.

Question 30

When do wavelengths of visible light decrease?

Answer 30

When going along the spectrum (ROYGBIV)

Question 31

What is a concentrated beam of light called?

Answer 31

Laser.

Question 32

What can lasers be used to remove?

Answer 32

Birth marks, tattoos and can be used to vaporise tumours.

Question 33

What can UV light be used to treat?

Answer 33

Acne

Question 34

What is a security use for UV?

Answer 34

It can be used when paired with fluorescent chemicals that can only be seen using UV light.

Question 35

What does CAT stand for?

Answer 35

Computer Aided Tomography.

Question 36

What can X-Rays be used for?

Answer 36

They allow people to investigate the structure of materials down to the arrangement of atoms in crystals.

Question 37

What ground breaking discovery was made using the X-Ray?

Answer 37

Double Helix.

Question 38

What can Gamma be used for?

Answer 38

Gamma emitting chemicals can be used as tracers. Gamma emitting chemicals are injected into the bloodstream and can be tracked with a gamma camera.

Question 39

What can tracers be used to detect except for being injected in the blood?

Answer 39

Can be used to detect cracks in pipes.

Question 40

What is Radiotherapy?

Answer 40

It is the process of using gamma radiation to damage cancer cells and stop them from reproducing.

Question 41

What is refraction?

Answer 41

It is the process where the speed of a wave changes as it travels from one medium into another.

Question 42

What happens when light travels at an angle into the normal from one medium to another?

Answer 42

The direction of the light also changes.

Question 43

Describe a Convex lens.

Answer 43

Oval shaped, with the light converging on each other when leaving the lens.

Question 44

Describe a Concave lens.

Answer 44

It is a rectangle shape with two oval half oval cutouts, the light diverges when from each other when leaving the lens.

Question 45

What is the angle of incidence?

Answer 45

It is the angle at which the light enters a medium.

Question 46

Why are bones white on a black background when using an X-Ray?

Answer 46

Because X-Rays are absorbed by bone.