When the ball hangs from the ligament, it stretches a certain amount. If the ball is then pulled downward, the ligament experiences a greater stretch. When the ball is subsequently released, what is the direction of the net force on the ball?

the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.

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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