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f = 100 MHz =====>> 10^8 Hz
En = n.h.f
P.t = n.h.f
n = P.t/h.f
n = 990/6,6.10⁻³⁴ . 10⁸
n = 990/6,6.10⁻²⁶
n = 150 × 10²⁶