Question 1

What is 640 nm in eV?

Accepted Answer

640 nm = 1.9373 eV. Use the converter on this page to convert to other photon energy units instantly.

Question 2

How do you convert nm to eV?

Accepted Answer

Formula: E(eV) = 1239.84 ÷ λ(nm) · f(THz) = E(eV) × 241.799 · E = hc/λ = hf. Multiply your nm value by the appropriate factor to get eV, or use the interactive converter above.

Question 3

What is 1.9373 eV in nm?

Accepted Answer

1.9373 eV = 639.9845 nm.

nm	eV
625 nm	1.9837
630 nm	1.968
635 nm	1.9525
640	1.9373
645 nm	1.9222
650 nm	1.9074
655 nm	1.8929

640 nm to eV

Formula