The beat frequency is calculated by taking the absolute difference between the two frequencies. To find the lowest beat frequency among the given options, we can calculate the differences:
-
500 Hz and 501 Hz:
Beat frequency = |500 Hz - 501 Hz| = 1 Hz -
10 Hz and 15 Hz:
Beat frequency = |10 Hz - 15 Hz| = 5 Hz -
10 Hz and 20 Hz:
Beat frequency = |10 Hz - 20 Hz| = 10 Hz -
500 Hz and 600 Hz:
Beat frequency = |500 Hz - 600 Hz| = 100 Hz
From these calculations, the combination of 500 Hz and 501 Hz produces the lowest beat frequency of 1 Hz.