Short Answer TypeThe wavelength of waves produced on the surface of water is 20 cm. If the wave velocity is 24 m/s, calculate:
i) State the purpose of a fuse in an electric circuit. Name the material used for making a fuse wire.
ii) Mention two factors on which the internal resistance of a cell depends.
i)
Fuse is a safety device put in a circuit, to prevent the flow of any excess current in the circuit, which might cause further damage.
It is made of solder, an alloy of lead and tin.
ii)
The internal resistance of a cell depends upon,
1. surface area of electrodes,
2. concentration of electrolyte,
3. distance between the electrodes.In winter, the weather forecast for a certain day was ‘severe frost’. A wise farmer watered his fields the night before to prevent frost damage to his crops. Why did he water his fields?
10125 J of heat energy boils off 4.5 g of water at 100oC to steam at 100o C. Find the specific latent heat of steam.
A ball of mass 0.20 kg is thrown vertically upwards with an initial velocity of 20 m/s. Calculate the maximum potential energy it gains as it goes up.
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