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KVPY SA Exam 2011 Question Paper
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© examsnet.com
Question : 22
Total: 80
A girl standing at point P on a beach wishes to reach a point Q in the sea as quickly as possible. She can run at 6 km
h
−
1
on the beach and swim at 4 km h
−
1
in the sea. She should take the path
PAQ
PBQ
PCQ
PDQ
Validate
Solution:
In beach velocity is higher
∴ beach is rarer and sea is denser medium
So when it go from rarer to denser medium it bend toward normal to reach in minimum time.
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