Question

3. Light with an average flux of 20 W/cm2 falls on a non-reflecting surface at
normal incidence having surface area 20 cm2. The energy received by
thesurface during time span of 1 minute is: / 20 cm2 क्षेत्रफल के किसी अपरावर्ती पृष्ठ पर
20 W/cm2 औसत फ्लक्स के साथ प्रकाश अभिलम्बवत आपतन करता है। 1 मिनट की समयावधि
5 में इस पृष्ठ पर प्राप्त की गयी ऊर्जा है:-
(1) 12 x 10 J
(2)24x103J
(3)48x103J
(4) 10 x 10°
O1​

Answer 1

Answer:

12×10j is the correct one

Answer 2

Answer:

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