Home » News & Blogs » The Journey of a Gravitational Wave III: GWs Stretch Out
Bookmark and Share
Living LIGO

The Journey of a Gravitational Wave III: GWs Stretch Out

21 Mar 2013, 14:51 UTC
The Journey of a Gravitational Wave III: GWs Stretch Out
(200 words excerpt, click title or image to see full post)

What happens to a gravitational wave between when it is produced and when LIGO can detect it? It turns out not much, which makes it a key new medium in which to observe the Universe!Today I will be discussing how a gravitational wave can get stretched during its journey to Earth. Previously, we have discussed how gravitational waves can be bent away from a straight path and how things cannot absorb or reflect a gravitational wave. THE DOPPLER EFFECTIf you have ever been passed by an ambulance or police car with its sirens on, then you likely noticed that as the sound from the siren approached you, the tone was higher than when the siren passed you. This is due to something called the Doppler effect. As the source of a sound is moving toward toward you, the distance between the sound wave's crests (wavelength) are compressed, resulting in a higher frequency. We hear higher frequencies as higher tones. Conversely, when the source of a sound is moving away from you, the sounds wave's crests are stretched apart resulting in a lower frequency and a lower tone. Consider the following animated example:Animated example of the Doppler effect: how motion and ...

Latest Vodcast

Latest Podcast

Advertise PTTU

NASA Picture of the Day

Astronomy Picture of the Day

astronomy_pod