El efecto Doppler: descubrimiento y experimentos del siglo XIX

The video explains the Doppler effect, a phenomenon where the pitch of a sound changes as the source moves relative to an observer. Named after Christian Doppler, the effect was first demonstrated in 1845 using a steam train and trumpeters. The BBC recreated this experiment in 1978, showing how the pitch changes for observers on the ground and on the train. The video also explains how sound waves behave when the source approaches or moves away, affecting frequency and wavelength. The Doppler effect applies to all wave types, including light, making it a fundamental concept in physics.

What happens to the pitch of a sound as an object approaches an observer?

• The pitch becomes higher.

• The pitch remains the same.

• The pitch fluctuates randomly.

• The pitch becomes lower.

Who was the scientist that first explained the Doppler effect?

• Christian Doppler

• Albert Einstein

• Galileo Galilei

• Isaac Newton

What was used in the historical experiment to demonstrate the Doppler effect?

• A boat and a bell

• A plane and a horn

• A car and a siren

• A steam train and trumpeters

How do sound waves behave when the source moves away from the observer?

• They come closer together.

• They become faster.

• They spread out, creating a longer wavelength.

• They remain unchanged.

Besides sound waves, to which other type of waves does the Doppler effect apply?

• Water waves

• Seismic waves

• Light waves

• Radio waves