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Two substances A and B of equal mass m a...

Two substances `A` and `B` of equal mass m are heated by uniform rate of `6 "cal"s^(-1)` under similar conditions. A graph between temperature and time is shown in figure. Ratio of heat absorbed `H_(A) //H_(B)` by them during complete fusion :-

A

(a)`(9)/(4)`

B

(b)`(4)/(9)`

C

(c)`(8)/(5)`

D

(d)`(5)/(8)`

Text Solution

Verified by Experts

The correct Answer is:
C
`H_(A) = (6 "cal"//s) xx (6-2)s`
`H_(B) = (6"cal"//s) xx (6.5 - 4)s`
`therefore (H_(A))/(H_(B)) = (4)/(2.5) = (8)/(5)`
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ALLEN -GEOMETRICAL OPTICS-EXERCISE -02
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