wht is the energy of photons tht corresponds to a wave of 2.5×10^-5 cm^-1
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λ⁻¹=2.5×10⁶m⁻¹
E=hc/λ
=6.63×10⁻³⁴×3×10⁸×2.5×10⁶
=49.725×10⁻²⁰
for 1J of energy 1/49.725×10²⁰ photons required
=2.011×10¹⁸
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