Short Answer TypeWhat type of wave front is produced by:
(i) Point source of light (ii) Line source of light
A fish is located at a distance of 10 cm from the wall of a fish pond. The thickness of the glass wall is 2 cm. Find the apparent position of the fish. (Given
aμg = 3/2 and aμw= 4/3)
Radio Carbon dating : The isotope of the C-atom i.e. 
as half-life period of 5568 years. Carbon Isotope is produced from atmospheric nitrogen by collision of neutrons. When the plant and animals absorbs carbon from C0 (carbon dioxide) presented in atmosphere. Thus, the isotope of 
is in the same proportion for plants and animals in the atmosphere. When the organism dies, no more 
is taken in and it starts decaying within organism. So by measuring the amount 14C left in organism, its age can be determined.
Let n0 be the number of 
in organism at death time t = 0.
When, 
Now a days the carbon dating technique is useful for research and dating of archeological things.
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