SPM Physics: AHA! Sound Speeds Up, Light Slows Down – The Classic Trap

 

Many students assume both sound and light behave the same in water. That’s the exam trap!

• Sound in water:
  Water particles are closer together → vibrations transfer more efficiently → speed of sound increases.

• Light in water:
  Water is optically denser than air → speed of light decreases → refraction occurs.

Exam tip: Write the full chain. Don’t just say “sound faster, light slower.” State the cause → effect → result for both. That’s how you secure marks.

AHA! Sound speeds up, light slows down. Not by sight, but by INSIGHT!

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