Phisics Light

Question 1

What is a luminous object

Answer 1

A object that produces light

Question 2

What is a non luminous object

Answer 2

A object that reflects light

Question 3

Give 4 examples of luminous objects

Answer 3

The sun
A lightbulb
TV
Phone

Question 4

Give 3 examples of non luminous objects

Answer 4

The moon
Windows
A mirror

Question 5

Define transparent

Answer 5

Allows light to pass through

Question 6

Define translucent

Answer 6

Allows some light to pass through

Question 7

Define opaque

Answer 7

Allows no light to pass through

Question 8

True or false light come from the eyes

Answer 8

False

Question 9

What happens when you move a pinhole camera towards the lamp

Answer 9

The image gets bigger and clearer

Question 10

What happens when you tilt the camera to the right

Answer 10

The image moves to the left

Question 11

What happens if you make a pinhole camera hole a bit bigger

Answer 11

I makes the image brighter more vibrant and blurry

Question 12

What happens if you add a extra hole to a pinhole camera

Answer 12

There is more detail and more of the image

Question 13

Describe the relationship between the number of holes in a pinhole camera and the image

Answer 13

The more hole in a pinhole camera the more images there are

Question 14

Why is a image formed

Answer 14

Because light travels in straight lines

Question 15

What happens if we use a large hole and a lens

Answer 15

We get an image that is both sharp and bright

Question 16

Why is the image in a pinhole camera always upside down

Answer 16

Because the camera is smaller than the object

Question 17

True or false the angle of incidence is always bigger than the angle of reflection

Answer 17

False the angle of incidence and the angle of reflection are always the same

Question 18

what are the 4 propities of light

Answer 18

Travels in straight lines
Can travel through a vacum (recqiers no particals to travel)
Travels at the speed of light(300 milliom m/s)
Travels faster than sound

Question 19

Name the 7 parts of the electromagnetic spectrum

Answer 19

Radio
Microwave
Infrared
Visible
Ultraviolet
X-ray
Gamma ray

Question 20

Name 2 propities of radio waves

Answer 20

They are used for communicating over large distances
Short wavelength radio waves are used for television brooadcasting and FM radio

Question 21

Name 2 propities of microwave waves

Answer 21

They are somtimes used for cooking
They can be dangerous if missused and can cause damage to living cells.

Question 22

Name 2 propities of infrared waves

Answer 22

They are given out by warm objects
Our skin is sensitive to them

Question 23

Name 2 propities of visible waves

Answer 23

They are used to carry signals down optical fibres
It is the part of the spectrum our eyes are most sensittive to.

Question 24

Name 2 propities of Ultraviolet waves

Answer 24

They are emited by the sun
Over exposure can lead to cancer

Question 25

Name 2 propities of X-ray waves

Answer 25

They have a very short wavelength and high frequency They are used to look for damaged bones in the body.

Question 26

Name 2 propities of Gamma waves

Answer 26

Incorrect exposure can cause cancer They can be used to kill certain types of cancer

Question 27

What simple object can you use to send bright flashes of sunlight to someone and what does it do to the rays of the sun

Answer 27

A mirror It reflects them

Question 28

Which out of the objects is the A) brightest B) can show green light C) Not very bright Flood lights Lit candle Traffic lights Car break lights

Answer 28

A) flood lights B) Traffic lights C) Lit candle

Question 29

Why is a plane (flat) mirror not suitable as a bicycle reflector

Answer 29

It doesn’t (always) reflect back to the driver

Question 30

As glass goes into a glass block, it changes direction what is this effect called

Answer 30

Refraction

Question 31

What part of the electromagnetic spectrum is normally used for A mobile phone A TV remote control

Answer 31

Microwave Infrared

Question 32

What type of radiation do you feel if you sit in front of a fire

Answer 32

Infrared

Question 33

Why are x-rays used to take photos of teeth at dentists

Answer 33

Because they pass through sold tissues

Question 34

Why do dentists leave the room/ho behind a screen when the x-ray is on

Answer 34

Because x-rays damage cell and the radiation is danerous