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Unformatted text preview: over a vertical distance of 0.6 cm. With the electric field (directed downwards) off, a droplet is observed to fall over this distance in a time of 21.0 s. With the electric field turned on, the droplet is observed to rise with constant velocity. Over time, this velocity varies discontinuously. The following two rise times were measured: 46.0 s and 15.5 s. Deduce the ratios of the charges on the droplet corresponding to these two rise times and show that it is the ratio of two small integers. 10 pts. 2. (a)Using the Bohr theory of the atom, calculate the wavelength in meters of the photon emitted when a helium atom (Z =2) makes a transition from the state n=3 to the state n=2. (b)What is the radius of the n=2 orbit in meters ?...
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 Spring '08
 Hirsch
 Physics, Charge, Mass

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