Question

Kundt's tube method is used for detection of Ultrasonic wave of

• A. Very Short Wavelength
• B. Long Wavelength
• C. None of these
• D. wavelength

Answer 1

Answer: (B)

Long Wavelength

Answer 2

Kundt's tube method relies on visualizing standing wave nodes via powder collection. For clear observation, the distance between nodes ($\lambda/2$) must be large enough. Thus, it's suitable for ultrasonic waves with relatively long wavelengths, not very short ones.