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Q. A girl rides an escalator that moves foward at a constant speed. As the girl raises, how do her gravitational energy and kinetic energy change?

Q. A new experiment is created with the screen at a distance of 1.9 m from the slits (with spacing 0.1 mm). What is the distance between the second order bright fringe of light with l = 697 nm and the third order bright fringe of light with l = 407 nm? (Give the absolute value of the smallest possible distance between these two fringes: the distance between bright fringes on the same side of the central bright fringe.)

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