Which of the following option is a correct expression for radiation...

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Which of the following option is a correct expression for radiation pressure \( P \) if a change in
\( \mathrm{P} \)
linear momentum \( p \) over an Area \( A \) in the time \( \Delta t \) ?
W
(The symbols \( U \) and \( c \) are Total energy and speed of light in free space respectively).
(1) \( P=\frac{U}{A c \Delta t} \)
(2) \( P=\frac{U^{2}}{A c \Delta t} \)
(3) \( P=\frac{U}{A \Delta t} \)
(4) \( P=\frac{U v}{A c \Delta t} \)
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