Multiple choice

A blue glass, when heated, will glow with

  1. blue colour

  2. red colour

  3. white light

  4. yellow colour
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When any solid material is heated to incandescence (glowing due to heat), it emits light according to blackbody radiation principles. The color depends on temperature - as temperature increases, the glow progresses from dull red to bright red, orange, yellow, white, and finally blue-white. A blue glass will still glow red first when heated because lower temperatures (around 700-800°C) produce red glow. The glass color only affects which wavelengths are transmitted in transmitted light, not the thermal emission color.

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