Calculate the amount of energy present in the following

Calculate the amount of energy present in the following photons and find the region of electromagnetic spectrum for each.

How much energy is contained in each of the following?

(a) 250 photons with a wavelength of 3.0m.
(b) 4.2 x 10^6 photon with a wavelength of 92 um:

Finding the energy of the photons by using de-Broglie wavelength.

How much energy is contained in each of the following

(a) 1.78x10^22 photons with a wavelength of 2.1 A?
(b) To which region of the electromagnetic spectrum does each wavelength belong?

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