The frequency from 3 × 10⁹Hz to 3 × 10¹⁰ Hz is __________
A. high frequency band
B. super high frequency band
C. ultra high frequency band
D. very high frequency band
Answer:B
The frequency from 3 × 10⁹Hz to 3 × 10¹⁰ Hz is __________
A. high frequency band B. super high frequency band C. ultra high frequency band D. very high frequency band