Short Answer TypeName any two electromagnetic waves, which have a frequency higher than that of violet light. State one uses of each.
State two ways by which the frequency of the transverse vibrations of a stretched string can be decreased.
Why does the temperature of the surroundings start falling when the ice of a frozen lake starts melting?
Ice has the highest specific latent heat of fusion of 333,000 Jkg-1. Thus, when the ice is in a frozen state lake starts melting as it absorbs large amount of heat energy from the surroundings. This leads to a decrease in the atmospheric temperature.
Four resistances of 2 ohm each are joined end to end to form a square ABCD. Calculate the equivalent resistance of the combination between any two adjacent corners.
In a three-pin plug, why is the earth pin made longer and thicker than the other two pins?
State the energy change which takes place when a magnet is moved inside a coil having a galvanometer at its ends. Name this phenomenon.
Calculate the heat energy that will be released when 5.0 kg of steam at 100oC condenses to form water at 100o C. Express your answer in S.I. unit. (Specific latent heat of vaporization of steam is 2268 kJ.kg)
With the help of an equation, state the mechanism of energy production in a nuclear fusion reaction.
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