Required Practical 10 - Infrared Radiation

Question 1

What does this practical investigate

Answer 1

the amount of infrared absorbed or radiated by different surfaces

Question 2

what is infrared radiation

Answer 2

part of the em spectrum and is a type of thermal radiation

Question 3

What do we use to see how much IR is emitted from different surfaces

Answer 3

Leslie’s cube

Question 4

What are the 4 surfaces on a leslie cube

Answer 4

shiny metallic
white
shiny black
matt black

Question 5

what is the method for emission of IR waves

Answer 5

pour hot water into the leslie cube then use an infrared detector to detect the amount of infrared emitted

Question 6

what do we have to ensure with the infrared detector

Answer 6

that it is equal distance everytime to make results repeatable

Question 7

what are the findings on emission of infrared red (least to most)

Answer 7

shiny metal (least)
white
shiny black
matt black

Question 8

what is the practical set up for investigating absorption of IR

Answer 8

Use an infrared heater and on either side two metal plates
one plate = shiny
one plate = matt black
use vaseline on other side of plates to attach drawing pin
Record time taken for pins to fall off

Question 9

what are the findings from absorption of IR practical

Answer 9

the matt black absorbs IR faster than shiny