What is the number of photons with a wavelength of 4000 pm that provid

1.	What is the number of photons with a wavelength of 4000 pm that provide 1 J of energy?
Answer» Wavelength of light, λ = 4000 pm = 4000 x 10^-12 m Energy provided, E = 1 J Energy per photon = hc/λ If N is the number of photons that provide 1 J energy, we can write 1 J = N x hc/λ or, N = {1 J x λ}/{hc} = {15 x 4000 x 10^-12 m}/{6.626 x 10^-34 Js x 3 x 10⁸ m/s} = 2.012 x 10¹⁶

What is the number of photons with a wavelength of 4000 pm that provide 1 J of energy?

Answer»

Wavelength of light, λ = 4000 pm = 4000 x 10^-12 m

Energy provided, E = 1 J

Energy per photon = hc/λ

If N is the number of photons that provide 1 J energy, we can write

1 J = N x hc/λ

or, N = {1 J x λ}/{hc}

= {15 x 4000 x 10^-12 m}/{6.626 x 10^-34 Js x 3 x 10⁸ m/s}

= 2.012 x 10¹⁶