For a particular tube, among six harmonic frequencies below 1000 Hz, only four harmonic frequencies are given : 300 Hz, 600 Hz, 750 Hz and 900 Hz. What are the two other frequencies missing from this list?
A. 100 Hz, 150 Hz
B. 150 Hz, 450 Hz
C. 450 Hz, 700 Hz
D. 700 Hz, 800 Hz
Answer:B
For a particular tube, among six harmonic frequencies below 1000 Hz, only four harmonic frequencies are given : 300 Hz, 600 Hz, 750 Hz and 900 Hz. What are the two other frequencies missing from this list?
A. 100 Hz, 150 Hz B. 150 Hz, 450 Hz C. 450 Hz, 700 Hz D. 700 Hz, 800 Hz