Question

Which of the following is the frequency range of ultrasonic detection?

• A. 100 KHz to 50MHz
• B. 50 KHz to 100 KHz
• C. 100 GHz to 200 GHz
• D. 10 KHz to 100 MHz

Hint:

Ultrasound Frequencies. Ultrasound = Sound above 20 kHz. Common application ranges: Medical (2-18 MHz), Industrial NDT (0.1-50 MHz), Cleaning/Sonar (20-100 kHz).

Answer 1

The Correct Option is A

Ultrasound refers to sound waves with frequencies higher than the upper limit of human hearing, which is typically around 20 kilohertz (20 kHz)
Ultrasonic detection techniques utilize these high-frequency sound waves for various applications like medical imaging, non-destructive testing, sonar, etc
The specific frequencies used depend heavily on the application: - Medical ultrasound typically uses frequencies in the range of 2 to 18 megahertz (MHz)
- Industrial non-destructive testing often uses frequencies from 0
1 MHz (100 kHz) up to 25 MHz or sometimes 50 MHz
- Lower ultrasonic frequencies (e
g
, 20-100 kHz) are used in cleaning and sonar
Considering the range used for "detection" in a broad sense (including imaging and testing), the range from 100 kHz up to 50 MHz (Option 1) encompasses the frequencies commonly employed in major ultrasonic detection applications
The other ranges are either too narrow, too low, or far too high (GHz range is microwaves/radio waves)