Physics 4.11 - 4.14

Question 1

What are the two types of microwaves

Answer 1

The two types of microwaves are those that can get absorbed by water and those that don’t get absorbed by water

Question 2

Name some uses of both types of microwaves

Answer 2

Microwaves that get absorbed by water are used to heat food in microwaves because food has water which gets heated by the microwaves and those particles transfer energy to neighbouring particles which causes the food to heat up

Microwaves that dont get absorbed by water can be used for communication for example: overseas communication or satelite communication. The earth’s atmosphere contains water so in order to prevent the wave from being interupted by the water, we can use microwaves that don’t get absorbed by water

Question 3

What is infrared radiation emitted by

Answer 3

It is emitted by objects that release thermal or heat energy

Question 4

What is infrared radiation used for

Answer 4

It is used in cooking or heating up homes through heaters etc

Question 5

True or false: The hotter the object the less infrared energy emitterd

Answer 5

False: The hotter an object is, the more infrared radiation it emits

Question 6

What is fluoressence?

Answer 6

Fluoressence is when uv light is absorbed by particles which is them re emitted as visible light

Question 7

Name 3 ways UV light can be used

Answer 7

Security
Sun tans
Sterilization of water

Question 8

Name one way visible light is used

Answer 8

It is used in optical fibers or fiber optic cables

Question 9

What can x rays be used for

Answer 9

Body scans

Question 10

How are x ray images formed

Answer 10

Xrays are fired through an object and caught by a detector plate behind the object. The xray image starts off completely white and the areas that the object allows xrays to pass through turn black on the image and the areas that don’t allow xrays to pass through remain white or turn gray because a few xrays have passed through

Question 11

What are gamma rays used for

Answer 11

They can be used for sterilizing equipment, curing food, treat cancer

Question 12

What type of wave are sound waves

Answer 12

They are longitudinal waves

Question 13

What is the average speed of sound waves

Answer 13

343 m/s

Question 14

What mediums can sound travel through in order of best to worst?

Answer 14

Solid, liquid, gas

Question 15

What mediums can’t sound travel through?

Answer 15

vacuums