MCQ practice · SSC Physics Board questions · Chapter 7: Waves and Sound
What is the range of frequency of the sound used in ultrasonography?
Think it through first, then pick an option.
- a (20 − 2000) Hz
- b (20 − 20,000) KHz
- c (1 − 10) MHz
- d (1 − 10) GHz
Answer and explanation
Correct answer: c (1 − 10) MHz
Ultrasonography uses ultrasound of about 1 to 10 MHz.
Why the other options are wrong
- a (20 − 2000) Hz: 20 to 2000 Hz is the low part of the hearing range; the sound of ultrasonography lies above the hearing range.
- b (20 − 20,000) KHz: 20,000 kHz is 20 MHz, beyond the medical scanning range; 20 kHz is only the upper hearing limit.
- d (1 − 10) GHz: GHz is far too high for a sound wave used in scanning.
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