# Problem: The power of a red laser (λ = 630 nm) is 2.50 watts (abbreviated W, where 1 W = 1 J/s). How many photons per second does the laser emit?

###### FREE Expert Solution
97% (119 ratings)
###### 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)

97% (119 ratings) ###### Problem Details

The power of a red laser (λ = 630 nm) is 2.50 watts (abbreviated W, where 1 W = 1 J/s). How many photons per second does the laser emit?

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the The Energy of Light concept. You can view video lessons to learn The Energy of Light. Or if you need more The Energy of Light practice, you can also practice The Energy of Light practice problems.

What is the difficulty of this problem?

Our tutors rated the difficulty ofThe power of a red laser (λ = 630 nm) is 2.50 watts (abbrevi...as medium difficulty.

How long does this problem take to solve?

Our expert Chemistry tutor, Sabrina took 6 minutes and 8 seconds to solve this problem. You can follow their steps in the video explanation above.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Habel Rodriguez's class at UNM.