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Activity 10.4 — Tyndall Effect

NCERT Activity 10.4: Shine light through true solutions, colloids, and suspensions to observe the Tyndall Effect — when light scattering makes the beam visible.

How To Perform

1

True Solution

Shine light through salt water — the beam is invisible from the side.

2

Colloid

Shine light through milk water — the beam becomes visible (Tyndall Effect).

3

Suspension

Shine light through muddy water — the beam is very visible.

4

Compare All Three

See all setups side-by-side and compare the scattering.

5

Classify the Response

Explain why light is visible through fog but not through clear air.

⚠️ Safety Notes

  • •Use a laser pointer or focused flashlight for the light beam — avoid looking directly into the light source.
  • •Do not drink the solutions used in the experiment.
  • •Clean the beakers thoroughly before and after the experiment.