Posted by **JeFF** on Sunday, March 1, 2009 at 2:44pm.

1. Calculate the frequency (Hz) and energy (eV) of green photons with wavelength of 555nm. Photon energy = hν, where ν = frequency in Hz and h = 6.626x10-34 joule-sec, the Planck’s constant. Keep in mind that: wavelengthxfrequency = speed.

2. Andy Ruddick can serve tennis balls at 140 mile per hour. When the ball is frying at this speed, calculate the kinetic energy and express it in Joules. You would need to measure the mass of a tennis ball in grams. For your information, 1 oz. = 454 grams/16 = 28.4 grams.

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