Infrasound - Low-Pitch Sounds

The video explores the concept of ghostly feelings and their possible connection to infrasound, which is sound too low for humans to hear. It explains the characteristics of infrasound, its sources such as volcanoes and elephants, and how elephants use it for long-distance communication. Although humans cannot hear infrasound, they can feel its vibrations, which might cause eerie sensations.

What might cause the eerie sensation of a ghostly presence according to scientists?

• High-frequency sounds

• Infrasounds

• Visible light

• Ultrasounds

What is the frequency range of infrasound?

• Below 20 waves per second

• Exactly 20 waves per second

• Between 20 and 20,000 waves per second

• Above 20,000 waves per second

Which of the following is NOT a source of infrasound?

• Waterfalls

• Volcanoes

• Birds

• Lorries

How do elephants use infrasound?

• To navigate through forests

• To locate water sources

• To communicate over long distances

• To scare predators

How can humans perceive infrasound if they cannot hear it?

• Through visual signals

• Through taste

• By feeling the vibrations

• By smelling it