The Doppler effect
It is a well-known phenomenon that the sound of an approaching sound source is higher than that of a receding one.
This animation explains the most important characteristics of waves through sound waves.
The Chengdu J-20, also known as Mighty Dragon, is a multiple function stealth fighter aircraft.
The first supersonic passenger airliner entered service in 1976.
Lasers are devices designed to emit narrow, monochromatic, high-intensity beams of light.
In loudspeakers sound waves are generated by electromagnetic induction.
The train operates between Paris and southern Germany, its cruise speed is 320 km/h.
Massive accelerating or orbiting bodies cause ripples in spacetime. These are called gravitational waves.
This animation demonstrates how sonar works.
Bats use ultrasound to navigate and hunt for prey.
In 1946 a Hungarian scientist was the first person to detect radar echoes from the Moon.
Waves play an extremely important role in many areas of our lives.
An earthquake is one of the most devastating natural phenomena.