Which of the following types of waves can be felt by human beings?

The correct answer, vibrations, refers to mechanical waves that can be sensed by the human body, typically through touch. These waves travel through various mediums, such as solids, liquids, and gases, and are able to stimulate the sensory receptors in our skin and inner ears. For example, when you hear music, the vibrations from the sound waves cause physical movement in the air molecules, which can then be felt as sound and also as a physical sensation if the intensity is strong enough.

In contrast, the other types of waves listed do not directly translate into sensations that can be felt by human beings in the same way. Radio waves, radar waves, and light waves are forms of electromagnetic radiation that travel through space. While we can detect light waves visually and radar waves indirectly through technology, they do not induce a tactile sensation on human skin like vibrations do. Therefore, vibrations are the only waves in the list that can be physically experienced by humans.