Question

light and matter begin date: 9/2/2025 12:01:00 am due date: 9/5/2025 11:59:00 pm end date: 9/8/2025 11:59:00 pm problem 31: (3% of assignment value) fill - in - the - blank when christian doppler, in the middle of the 19th century, discovered that when the source of waves is moving toward us or away from us, the ____ of the wave changes, little did he dream of all the ways his discovery would be used in our time. when an astronomer obtains a spectrum of a nearby star moving toward us, they can determine its __ coming toward us by measuring the __ of a __. when a highway patrol officer points a radar gun at a speeding driver, they will measure the equivalent of a __ as the driver moves away from the officers position. please use the drag - and - drop environment to put the correct words in the right places. (please note: not all draggable items will be used.) when christian doppler, in the middle of the 19th century, discovered that when the source of waves is moving toward us or away from us, the __ of the wave changes, little did he dream of all the ways his discovery would be used in our time. when an astronomer obtains a spectrum of a nearby star moving toward us, they can determine its __ coming toward us by measuring the __ of a __. when a highway patrol officer points a radar gun at a speeding driver, they will measure the equivalent of a ____ as the driver moves away from the officers position. draggable items: amplitude, blackshift, blueshift, continuous, redshift, spectral line, speed, wavelength, radiation grade summary deductions 0% potential 100% submissions attempt(s) remaining: 999 2% deduction per attempt detailed view

Explanation:

The Doppler effect is the change in frequency (or wavelength) of a wave in relation to an observer who is moving relative to the wave - source. When a star moves towards us, there is a blueshift. When it moves away, there is a redshift. In radar for speed - detection, the change in the returned radar wave's frequency (related to wavelength) is used to measure speed.

Answer:

When Christian Doppler, in the middle of the 19th century, discovered that when the source of waves is moving toward us or away from us, the wavelength of the wave changes, little did he dream of all the ways his discovery would be used in our time. When an astronomer obtains a spectrum of a nearby star moving toward us, they can determine its speed coming toward us by measuring the blueshift of a spectral line. When a highway patrol officer points a radar gun at a speeding driver, they will measure the equivalent of a redshift as the driver moves away from the officer's position.