light and black body radiation

Question 1

what is visible light described as?

Answer 1

electromagnetic waves that cann be detected by the human eye

Question 2

what does the word incident mean when talking about light?

Answer 2

the point at which the light hits an object

Question 3

what are all the possible things that can happen if light hits an object

Answer 3

the object can:absorb,reflect or transmit the light

Question 4

what is reflection by a smooth surface in a single direction called

Answer 4

specular reflection

Question 5

what is a reflection from a rough surface,where the light is scattered called

Answer 5

a diffuse reflection

Question 6

all objects are ____

Answer 6

transparent,translucent,or opaque

Question 7

what does it mean if an object is transparent

Answer 7

the object transmits light coherently,light rays do ot get jumbled,so objects on the other side are clearly seen

Question 8

what does it mean if an object is translucent

Answer 8

they transmit light but the rays are scattered so objects arent seen clearly through them e.g. frosted glass

Question 9

what does it mean if an object is opaque

Answer 9

they either reflect or absorb all light incident on them,so no light passes through them.

Question 10

what happens when all wavlength are reflected equally

Answer 10

the object appears white

Question 11

what happens when all wavlengths are absorbed

Answer 11

the object appears black

Question 12

if you look through a coloured filter at an object of the same colour what happens

Answer 12

the object appears as its true colour

Question 13

what happens if ,for example you view a red and blue object through a red filter?

Answer 13

you will see red and black instead of red and blue due to the blue not being able to pass through the red filter

Question 14

what happens if you use a green filter to view a red and blue object?

Answer 14

the whole object will appear black due to the colours no t being able to pass through the green filter

Question 15

all bodies (objects) 1. ______ and 2._____ infrared radiation

Answer 15

1. emit

2. absorb

Question 16

what does the rate an object emits radiation depend on

Answer 16

the nature of the surface and its temperature the hotter the body the faster it emits infrared radiation

Question 17

what are the features of a perfect black body radiation

Answer 17

it absorbs all of the infrared radiation incident on it

it does not reflect or transmit any infrared radiation

Question 18

what does the temperature of an object determine

Answer 18

the rate at which it emits radiation

the wavelength of the radiation it emits

Question 19

as the 1.____increases the amount of 2._____ an object emits at all wavelengths increases but the intensity of 3._____wavelengths increases faster

Answer 19

1. temperature
2. radiation
3. shorter

Question 20

as an object is heated it first glows 1.__________ as it gets hotter it emits even shorter wavelengths and it becomes 2.______

Answer 20

1. red hot

2. whiter