Which one of the following is not an electromagnetic wave?

What is Ultrasonic Wave?

Ultrasonic waves cannot be heard by humans. Between 20 Hz and 20 kHz in frequency, humans are capable of hearing noises. In addition to radio waves and microwaves, EM waves also include light, UV, X, and gamma rays. These waves have many uses depending on the differences in wavelength and frequency.

Thermal waves are essentially what infrared radiation is. In electronic applications like TV remote sensors, these are employed. Cameras also use thermal imaging. Point-to-point communications frequently involve microwave technology. These are also utilized for spaceship communication because they can be broadcast across great distances.

Electrons are accelerated to create X-ray radiation. These are employed to view pictures of the bones and other bodily structures.

Summary:

Which one of the following is not an electromagnetic wave? (A) Microwave (B) Ultrasonic (C) Infrared (D) X-rays

An electromagnetic wave is not an ultrasonic wave. Electromagnetic waves are created by the combined vibration of an electric field and a magnetic field. We can say that these are composed of oscillating magnetic and electric fields.