Question

Which of the following statements is correct?

• A. Ultrasonic waves can travel in vaccum.
• B. Wavelength of ultrasonic waves of the same order as that of microwaves.
• C. Speed of ultrasonic waves is of the same order as that of light.
• D. Frequency of ultrasonic waves is of the same order as that of x-rays.

Answer 1

Answer: (B)

In this question, we have to tell which statement is true.

A Option :$\to$ultrasonic waves can travel in the vacuum.

This statement is false.

because ultrasonic waves travel through various media including gases, liquids, and solids but cannot travel through the vacuum.

B Option: $\to$ Wavelength of ultrasonic waves some order of microwaves wavelength of ultrasonic = 1.9 cm or less

a wavelength of microwaves = 0.1 m or 1 mm

we see that wavelength is of same order so this option is correct.

C Option: $\to$ Frequency of ultrasonic waves is of the same order as that of X rays.

This is a false statement

Because the frequency of X rays much higher than ultrasonic waves.

D Option: $\to$ Speed of ultrasonic wave is the same of an order of light.

This statement is false because ultrasonic waves travel at much slower speed than a speed of light.