Questions on Energy Transitions
Q6. The drawing shows a bulb from a torch. When the torch bulb is connected to a battery it lights up.
(a) What happens to the temperature of the filament when the torch is first switched on?
The temperature rises or increases.
1 mark
(b) Energy from the battery is transferred to the bulb. The bulb transfers the energy to the surroundings. State two ways in which energy is transferred from the torch bulb to the surroundings.
answers may be in any order
- by thermal transfer or heat or infra red radiation
- by light or visible radiation
2 marks
(c) Ravi accidentally breaks the glass of the bulb in his torch. He notices that the filament is not broken, so he switches the torch on. The filament immediately 'burns out'.
(i) Which gas in the air is needed for the filament to burn?
Oxygen
1 mark
(ii) Suggest how the makers of light bulbs prevent filaments from 'burning out' inside sealed bulbs.
One from:
- Put no oxygen inside bulb
- Put inert or noble (or named noble) gas inside bulb
- Accept 'vacuum or no air inside bulb'
- Accept 'nitrogen or carbon dioxide inside bulb'
Do not accept 'make it air tight'
1 mark
Maximum 5 marks
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