(a) What is the wavelength (in m) of 92.0 MHz radio waves used in an MRI unit? 3.26 m (b) If the frequencies are swept over a +1.50% range centered on 92.0 MHz, what is the range (in m) of wavelengths broadcast? minimum 3.31 x m maximum 3.21 Additional Materials Reading [1/2 Points] DETAILS PREVIOUS ANSWERS OSCOLPHYS2016 24.4.P.034. MY NOTES ASK YOUR TEACHER PRACTICE ANC Suppose the maximum safe intensity of microwaves for human exposure is taken to be 1.00 W/m2. (a) If a radar unit leaks 42.4 W of microwaves (other than those sent by its antenna) uniformly in all directions, how far away (in cm) must you be to be exposed to an intensity considered to be safe? Assume that the power spreads uniformly over the area of a sphere with no complications from absorption or reflection. 1836 x cm (b) What is the maximum electric field strength (in V/m) at the safe intensity? (Note that early radar units leaked more than modern ones do. This caused identifiable health problems, such as cataracts, for people who worked near them.) 27.4 V/m