Two charges repel each other with a force. If the magnitude of both charges double, but the distance between them remains constant, the force between them will A. Double
B. Triple
C. Quadruple
D. Remain the same

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the answer is 100. i just did this lesson and got a 100% on it. : )

-fishtank

you'd use the equation that establishes a relationship between  energy  and  wavelength, which looks like this

e=h⋅cλ, where

λ  - the wavelength of the photon; c  - the speed of light, usually given as  3⋅108m/s; h  -  planck's constant, equal to  6.626⋅10−34j s

plug the value you were given for the energy of the photon in the above equation to get the wavelength

e=h⋅cλ⇒λ=h⋅ce

λ=6.626⋅10−34js⋅3⋅108ms−1.257⋅10−24j=1.581⋅10−1m