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akingbadeadeniji

Answer:

8.5*10-10

Explanation:

Using Velocity= frequency×wavelength

3×10^8=3.5×10^17/W

  • multiply both by 1/3.5×10^17

3×10^8×(1/3.5×10^17)=3.5×10^17/W × (1/3.5×10^17)

W=3×10^8/3.5×10^17

use calculator to divide, you'll get

W=8.5×10^-10

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