# Problem: A Na lamp emits yellow light with a wavelength of 589 nm. What is the energy in Joules of a single photon in this light?a. 3.38x10-19b. 1.12x10-25c. 1.17x10-33d. 5.09x1015

###### FREE Expert Solution

We’re being asked how many photons per second are being emitted by a red laser with a wavelength of 630 nm with a power of 2.50 watts

Recall that the energy of a photon (E) is given by:

where:

h = Planck’s constant (6.626 × 10–34 s)

v = frequency (in s–1)

Also, recall that the frequency (v) and wavelength (λ) are related:

where:

c = speed of light (3.0 × 108 m/s)

93% (56 ratings) ###### Problem Details

A Na lamp emits yellow light with a wavelength of 589 nm. What is the energy in Joules of a single photon in this light?
a. 3.38x10-19
b. 1.12x10-25
c. 1.17x10-33
d. 5.09x1015

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