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Main Menu Help Logout Go to the previous resource in the Go to the next resource in the course sequence a Show Metadata Provide my evaluation of this Provide feedback messages or contribute to the course Prepare a printable document discussion about this resource notes and annotations about this resource Set a bookmark for this resource PHY131s17, Homework 10: Visible Light Energy The wavelength of visible light varies from 380 nm to 750 nm as the color of the light changes from violet to red. Calculate the energy of a photon whose wavelength is 4-2e-07 m. Submit Answer Tries 0/20 Post Discussion

Explanation / Answer

Let c=the speed of light=3.0×108ms
Let =the wavelength=4.257×109m

f=c

f=7.0×1016Hz

b)

5990 J / 3.96E-19 J = 1.51 x 10^22 photons

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