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Q.

If solar constant is equal to $3 c a l {(minute)}^{- 1} c m^{- 2},$ its value in S.I. system is

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a

$140 W m^{- 2}$

b

$4.2 W m^{- 2}$

c

$2100 W m^{- 2}$

d

$8.4 W m^{- 2}$

answer is A.

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Detailed Solution

$x = 3 \frac{c a l}{m i n u t e c m^{2}}$

$= 3 \frac{(4.2 J)}{(60 s) {(10^{- 2} m)}^{2}}$

= $2100 \frac{J}{s m^{2}}$

= $2100 W m^{- 2}$

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