A cyclotron is a device in which clectrons gyrate in a uniform magnetic field B. In so doing they emit radio waves at the cyclotron frequency (see previous problem). The inventor of the cyclotron, Ernest O. Lawrence, was able to tell whether the apparatus was operating even when at home (and thus keep his graduate students up to the mark) by tuning a radio receiver to the appro- priate wavelength and listening for the hum. Lawrence's original cyclotron had B= 4.1 x 10- T. What wavelength was his radio tuned to?

A cyclotron is a device in which clectrons gyrate in a uniform magnetic field B. In so doing they emit radio waves at the cyclotron frequency (see previous problem). The inventor of the cyclotron, Ernest O. Lawrence, was able to tell whether the apparatus was operating even when at home (and thus keep his graduate students up to the mark) by tuning a radio receiver to the appro- priate wavelength and listening for the hum. Lawrence's original cyclotron had B= 4.1 x 10- T. What wavelength was his radio tuned to?