Thermal radiation and energy balance

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Question 23
Easy

A student investigates how the surface finish of a metal container affects the rate at which it emits infrared radiation.

The student uses a four-sided metal canister where each vertical face has a different surface finish. She fills the canister with hot water at 85degC so all surfaces start at the same temperature.

She uses an infrared radiation detector placed at a fixed distance from each surface to measure the relative intensity of emission.

A cylinder with four distinct vertical panels representing different surface finishes: matt black, shiny black, matt silver, and shiny silver. An infrared radiation sensor is directed toward the shiny black face, connected by a lead to a digital display showing a relative reading of '74'.

Draw a straight line from each surface finish to its correct relative emission reading. One has been done for you.

Surface finishRelative emission reading
Matt black●● 95
Shiny black●● 42
Matt silver●● 74
Shiny silver●● 18

(Note: A line is already drawn from Shiny black to the reading of 74.)

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Thermal radiation and energy balance Questions

  1. GCSE
  2. /Physics
  3. /Thermal radiation and energy balance