A pulsar is a type of rotating neutron star that emits a beam of electromagnetic radiation. Imagine a pulsar that is moving toward Earth at a speed of 880.500 km/s. It emits mostly radio waves with a wavelength (at the source) of 123.500 cm. What is the observed wavelength of this radiation on Earth? (Assume the Earth is stationary. Consider the speed of light c = 3.00000 108 m/s. Give your answer to at least six significant figures.)

123.4994673cm

Explanation:

In Doppler effect of light, frequency-source and frequency-observed are related by.

 where          

And frequency is related to wavelength by.  L is wavelength. and c is speed of light = 299792458m/s.

Now using this relationship, frequency source is = 242747976.5Hz.

and plugging this into f-source and f-observed relationship with V source = 880.500km/s = 880500m/s.

We get f observed is = 242747976.6Hz which when converted to wavelength gives L = 123.4994673cm.

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

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