GRADE 10 – OPTICS Exam Questions and Answers Graded A+

GRADE 10 – OPTICS Exam Questions
and Answers Graded A+

Luminous: - Correct answer-an object that emits/produces its own

light (eg. sun)

Non-luminous: - Correct answer-an object that does not produce its

own light and is visible due to reflected light

• Incandescence - Correct answer-Light emitted by a very hot object

- BULB: tungsten wire gets very hot

and glows brightly when electric

current runs through it

• Electric discharge - Correct answer-- emit light using a passing current to heat a

gas, or

vapour, instead of a heated wire

- E.g. sodium vapour bulb



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, Fluorescence - Correct answer-- light that is emitted during UV light exposure

-fluorescent bulb

Luminescence - Correct answer-- light that is generated without heating the object

• Phosphorescence - Correct answer-- light that is emitted during and following UV

light

exposure

- Lasts several minutes or even a few hours

-glow and the dark stickers

• Chemiluminescence - Correct answer-- light that is generated by the energy

released in a

chemical reaction.

-glowsticks

• Bioluminescence - Correct answer-- light that is produced by living organisms

-jelly fish

triboluminescence - Correct answer-is the production of light when certain crystals

are scratched, crushed, or rubbed



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