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A light-emitting device can generate a spectrum of photons with a range of energies that has a width of h x 1 x 1012 Hz , where h is Planck's constant. Based on Heisenberg uncertainty principle we can estimate the shortest possible light pulse time duration that can be generated from the device to be 79.58 x 10-15 second. Assuming the pulse is propagating (moving) at a speed of: c = 3 x 10 m/s, what is the uncertainty in the momentum measurement for this light pulse (in kg.metre/second units). Planck's constant: h=6.62607015 x 10-34 m'.kg/s O a. 6.626 x 10-30 O b. 0.159 x 10-12 O c. 2.21 x 10-30 Od. 3 x 1020 O e. 1 X 10-20 Previous page Next page - Ch02 Slides Jump to