RP10 - Radiation and Absorption Flashcards

1
Q

Outline the basic steps of the practical.

A
  1. Place a Leslie cube on to a heatproof mat and fill with hot water
  2. Use the infrared detector to measure the amount of radiation that is emitted from each side
  3. Draw a suitable chart to compare the results for each surface
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2
Q

What is a Leslie cube?

A
  • A cube with different textured surfaces used to demonstrate the differing radiation emitted.
  • Typically it has a matt white, a shiny silver/gold, a matt black and a shiny black side.
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3
Q

Why is a heatproof mat used?

A

Boiling water is poured into the cube meaning the base can get hot and so a mat is used to protect the desk.

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4
Q

What type of data is collected from this experiment?

A

The four different surfaces being measured produces categorical data.

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5
Q

Give an example of a chart that may be used to display the data.

A

A bar chart with radiation intensity on the y-axis and the four surfaces on the x-axis.

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6
Q

Which surface would you expect to emit the most radiation?

A

The matt black surface since good absorbers of radiation are also good emitters. Matt black surfaces are good emitters and poor reflectors.

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7
Q

Which surfaces would you expect to emit the least radiation?

A

The shiny surfaces, as they are good reflectors and poor emitters.

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8
Q

What type of radiation is being emitted?

A

Infrared radiation, which is part of the electromagnetic spectrum.

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9
Q

What piece of apparatus is useful when filling the cube and why?

A

A funnel since the opening is very small and it will reduce the likelihood of spillages.

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10
Q

What safety precaution should be taken when using a Leslie cube?

A

Avoid handling it with bare hands when filled with boiling water since the cube will be very hot.

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