Physics

Physics, 29.10.2019 18:31, kiki197701

By only measuring an object’s doppler shift, astronomers tend to by only measuring an object’s doppler shift, astronomers tend to exactly determine the object’s total speed. underestimate the object’s total speed. overestimate the object’s total speed.

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Physics, 29.07.2019 10:50, kahmir15

Laboratory experiments here on earth have determined that each element in the periodic table emits photons only at certain wavelengths. these photons are apparent to astronomers as either emission or absorption lines in the spectrum of an astronomical object, like stars in galaxies. astronomers can, by measuring the position of these spectral lines, determine which elements are present in the star itself or along the line of sight. when astronomers perform this analysis, they note that for most astronomical bodies, the observed spectral lines are all shifted to longer (redder) wavelengths. this is known as cosmological redshift and is analogous to the doppler redshift. what does this redshift indicate to us about the universe in general?

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Physics, 24.08.2019 03:30, trejoste1

Discuss the limitations of using the doppler shift to determine an object's speed.

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Physics, 17.09.2019 23:10, aaleeyahprice

Ahighway patrol officer uses a device that measures the speed of vehicles by bouncing radar off them and measuring the doppler shift. the outgoing radar has a frequency of 100 ghz and the returning echo has a frequency 15.0 khz higher. what is the velocity of the vehicle? note that there are two doppler shifts in echoes. be certain not to round off until the end of the problem, because the effect is small.

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Geography, 10.10.2019 23:00, mariap3504

2. how do doppler shifts of bipolar flows confirm that they lare moving away from a central object? a. astronomers observe that the spectra is red shifted. b. astronomers do not observe doppler shifts at all. c. astronomers observe that the soectra is blue shifted. d. astronomers observe both red and blue shifts in the spectra.

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