Pupil sheet · Thermal radiation
Thermal radiation — final check
Name ______________________ Date ____________
Work alone, with the lesson closed. Answer every question; there are no hints.
1. state / explain / describe
(a) State what kind of radiation thermal radiation is. (b) Explain why energy from the Sun can reach the Earth by radiation but not by conduction or convection. (c) Describe how the colour and texture of a surface affect how well it emits infrared radiation. (d) Supplement. Describe an experiment with a Leslie cube to compare how well different surfaces emit infrared. Say what you keep the same and what you measure. (e) Supplement. Besides its colour and texture, state two things that affect the rate at which a surface emits radiation.
(a) Kind of radiation
(b) Sun to Earth
(c) Colour and texture
(d) Supplement: the Leslie cube experiment
(e) Supplement: two other things
2. state / describe / explain
(a) State which is the better absorber of infrared: a dull black surface or a white surface. (b) State what a shiny surface does with most of the infrared that falls on it. (c) Supplement. Describe an experiment to show which of two surfaces is the better absorber of infrared. (d) Supplement. State the condition for an object to stay at a constant temperature. (e) Supplement. Explain how more carbon dioxide in the atmosphere affects the Earth’s temperature.
(a) The better absorber
(b) A shiny surface
(c) Supplement: the absorber experiment
(d) Supplement: constant temperature
(e) Supplement: carbon dioxide