A certain type of laser puts out light of known frequency. Thelight, however, oc

Question

A certain type of laser puts out light of known frequency. Thelight, however, occurs as a series of short pulses, each lastingfrom a time to.
a) How is the wavelength of the light related to its frequency?
b) How is the length (in meters) of each pulse related to the timeto?
c) A laser puts out a pulse of light that lasts for 2.7 x10-11 s. The frequency of the light is 5.2 x1014 Hz. How many wavelengths are there in onepulse?
d) The light enters a pool of water. Its frequency remains thesame, but the light slows down to a speed of 2.3 x 108m/s. How many wavelengths are there now in one pulse?

Explanation / Answer

   a.   Wavelength      =   speedof laser in medium / frequency                                  =   v/ f    b.   length ofpulse   =   speed * time                                   L   =   v* t0                                  =   3.0* 108 * t0                                  =   3.0* 108 * t0    c.  No. of wavelengths in apulse      n   =   L/                                                                   =   v* t0 /                                                                =   f* t0          n   =   5.2* 1014 * 2.7 * 10-11                =   1.404* 104   wavelengths                =   1.404* 104   wavelengths    d.   n   =   f* t0    since frequency remains the same, no. ofwavelengths in one pulse will also be same.       nwater   =   1.404* 104   wavelengths    since frequency remains the same, no. ofwavelengths in one pulse will also be same.       nwater   =   1.404* 104   wavelengths

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