Calculate the oscillation frequency f of the h2 molecule. use meff=m/2 as the "effective mass" of the system, where m in the mass of a hydrogen atom.

One day, after pulling down your window shade, you notice that sunlight is passing through a pinhole in the shade and making a small patch of light on the far wall. you see that the patch of light seems to be a circular diffraction pattern. it appears that the central maximum is about 1 cm across and you estimate that the distance from the window shade to the wall is about 3 m. what is (a) the average wavelength of sunlight? (b) the diameter of the pinhole?

Which changes of state do the labels represent? a: b: c:

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