What is a stroboscope? What is Venturi-meter? What are the precautions you should observe while doing the experiment with the vibration magnetometer? What detector is used to pick up the x-rays in hospitals? What is Light in astronomy?
what is the Doppler effect? Explain. What is a vibration magnetometer? What is the medium for convection? Identify and describe the steps of the scientific method. What is the spin of photons? Define Lens (astronomy). Define magnification in astronomy. ...
The further away something is, the further back in time you are looking. As the universe is expanding, the light from these distant objects is stretched into longer wavelengths. This is known as the redshift, and it is the light equivalent of the Doppler effect that you can hear when vehi...
The concept of redshift and blueshift is closely related to the Doppler effect — which is an apparent shift in soundwave frequency for observers depending on whether the source is approaching or moving away from them, according to the educational websiteThe Physics Classroom. The Doppler Effect w...
(Remember that three evenly spaced transits must be observed to register a discovery.) At the smaller sizes, the absence of planets much smaller than one earth radius is due to the difficulty of detecting transits by very small planets. In effect, the “discovery space” for Kepler was ...
The discovery of exoplanets has also intensified interest in the search for extraterrestrial life, particularly for those that orbit in the host star's habitable zone. Also known as the "goldilocks zone", this is the region of the solar system where conditions are warm enough (but not too war...
The Einstein Cross, aquasarin thePegasus constellation,according to the European Space Agency(ESA), and is an excellent example of gravitational lensing. The quasar is seen as it was about 11 billion years ago; thegalaxythat it sits behind is about 10 times closer to Earth. Because the two...
In 1995, building on earlier work by Bourgain, Wolff famously obtained (1) with using what is now known as the “Wolff hairbrush argument”, based on considering the size of a “hairbrush” – the union of all the tubes that pass through a single tube (the hairbrush “stem”) in ...
Because quasars put out so much power from such a small region, they can’t be powered by nuclear fusion the way stars are; they must use some process that is far more efficient. As we shall see later in this chapter, quasars were much more common when the universe was young than th...
Astronomers use the Doppler effect to measure the frequency of light waves as an object is moving with respect to the observer. The frequency is shorter as it moves toward you, and the object shows a blueshift. If the object is moving away, it shows a redshift. This shows up in spectra...