Infrasonido

The video explores the concept of infrasound, a low-frequency sound below human hearing. It explains how infrasound can cause ghostly sensations and is produced by natural and man-made sources like volcanoes and trucks. Elephants use infrasound to communicate over long distances. Although humans can't hear it, we can feel its vibrations, which might explain certain eerie feelings.

What is infrasound?

• A sound with a variable pitch

• A sound with a low pitch

• A sound with a high pitch

• A sound with a medium pitch

What is the frequency range of infrasound?

• Exactly 20 waves per second

• Between 20 and 100 waves per second

• Less than 20 waves per second

• More than 20 waves per second

Which of the following is NOT a source of infrasound?

• Waterfalls

• Volcanoes

• Birds

• Trucks

How do elephants use infrasound?

• To scare predators

• To navigate

• To communicate over long distances

• To find food

Why might humans feel a ghostly sensation?

• Due to seeing shadows

• Due to feeling infrasound vibrations

• Due to hearing high-pitched sounds

• Due to changes in temperature