SC-1355
Conduction
Lower Sec Science · Secondary 2 · Hard · Conduction
A teacher sticks drawing pins along a metal bar using small blobs of wax, then heats one end of the bar with a flame. After a while, the pins start falling off one by one from the heated end.
Which statement best explains this observation?
Which statement best explains this observation?
- Heat is conducted along the bar as particles transfer energy to neighbours, melting the wax
- Hot air from the flame blows the pins off the bar
- Heat is transferred only by radiation to the far end of the bar
- The bar contracts as it is heated and pushes the pins off
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