The energy of photon is 3.98×10^-21 J. What is its wavelength in nm?
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Hi wvlenth=hc÷E
6.626×10^-34×3×10^8÷3.98×10^-21 =4.99×10^-5
6.626×10^-34×3×10^8÷3.98×10^-21 =4.99×10^-5
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