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Q. The human eye is sensitive to blue light having a frequency of about 6.4 x10^14 Hz (a wavelength of about 475 nm). What is the energy in joules of the photons associated with this light?

Q. The similar ball is shot straight up a second time from the similar gun, but this time the spring is compressed only half as far before firing. How far up does the ball go this time? Neglect friction. Suppose that the spring is ideal and that the distance by which the spring is compressed is negligible compared to H.

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