PHY ICS - The Institute of Physics in Ireland
PHY ICS - The Institute of Physics in Ireland
PHY ICS - The Institute of Physics in Ireland
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A storm <strong>in</strong> a bottle <strong>of</strong> water<br />
UK<br />
Interference <strong>in</strong> an everyday context<br />
waves & sound 27<br />
You will need...<br />
✔ a 2 litre bottle <strong>of</strong> water<br />
(<strong>in</strong> our experience,<br />
River Rock works best)<br />
Background<br />
This demonstrates stand<strong>in</strong>g<br />
waves <strong>in</strong> two dimensions.<br />
Follow these steps<br />
1 Hold the bottle by the neck<br />
with one hand.<br />
2 Give the bottle a firm<br />
knock about midway along<br />
its length us<strong>in</strong>g the knuckles<br />
<strong>of</strong> your other hand.<br />
So what happened?<br />
A def<strong>in</strong>ite note is both felt<br />
and heard, but more<br />
dramatically a beautiful<br />
<strong>in</strong>terference pattern can be<br />
seen on the surface <strong>of</strong> the<br />
water <strong>in</strong>side the bottle.<br />
What next?<br />
See whether it matters if the<br />
cap is removed or the water<br />
level changed.<br />
<strong>PHY</strong>S<strong>ICS</strong> ON STAGE 3
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