It is estimated that per minute each $cm^2$ of earth receives about $2\ cal (1\ cal = 4.18\ J)$ of heat energy from the sun. This is called Solar constant. In $SI$ units the value is :-

  • A
    $1060$
  • B
    $178.4$
  • C
    $17.84$
  • D
    $1393.33$

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