O-LevelPhysicsWaves5054/11 · Oct/Nov 2024 · Q271 Mark
A student makes four statements about infrared waves. 1 They can be seen by the human eye. 2 They travel at 330 m/s in air. 3 They are transverse waves. 4 They are used by intruder alarms. Which statements are correct for infrared waves?
A1 and 3
B2, 3 and 4
C2 only
D3 and 4 only
✓ Correct answer
D: 3 and 4 only
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