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10-1.Thermometry, Thermal Expansion and Calorimetry
medium
Two substances $A$ and $B$ of equal mass m are heated at 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 for complete fusion is
A
$\frac{9}{4}$
B
$\frac{4}{9}$
C
$\frac{8}{5}$
D
$\frac{5}{8}$
Solution
(c) From given curve,
Melting point for $A = 60^\circ C$
and melting point for $B = 20^\circ C$
Time taken by $A$ for fusion $ = (6 – 2) = 4$ $minute$
Time taken by $B$ for fusion $ = (6.5 – 4) = 2.5$ $minute$
Then $\frac{{{H_A}}}{{{H_B}}} = \frac{{6 \times 4 \times 60}}{{6 \times 2.5 \times 60}} = \frac{8}{5}$.
Standard 11
Physics
Similar Questions
Match the following according to conversion by heat :
| Column $-I$ | Column $-II$ |
| $(a)$ Required heat to convert solid into gaseous. | $(i)$ Latent heat of fusion |
| $(b)$ Required heat to convert solid into liquid. | $(ii)$ Latent heat of vaporization. |
easy
