A state trooper chases a speeder along a straight stretch of road; both vehicles move at 164 km/h. The siren on the trooper's vehicle produces sound at a frequency of 475 Hz and the speed of sound in the air is 343 m/s. What is the Doppler shift in the frequency heard by the speeder

The Doppler effect can be calculated by:

f' = ((v - v0)/(v -vs))*f

where f is the frequency, v is the velocity of the wave, v0 is the velocity of the observer and vs is the velocity of the source.

But the observer and the source move at the same speed (bot cars have the same velocity), so here we will not see the doppler effect the relative velocity between the cars is 0m/s.

This means that the frequency that will be heard by the speeder is 475hz

The Hubble Space Telescope (often referred to as HST or Hubble) is a space telescope that was launched into low Earth orbit in 1990 and remains in operation. It was not the first space telescope, but it is one of the largest and most versatile, well known both as a vital research tool and as a public relations boon for astronomy. The Hubble telescope is named after astronomer Edwin Hubble and is one of NASA's Great Observatories, along with the Compton Gamma Ray Observatory, the Chandra X-ray Observatory, and the Spitzer Space Telescope.[7]  

Hubble features a 2.4-meter (7.9 ft) mirror, and its four main instruments observe in the ultraviolet, visible, and near-infrared regions of the electromagnetic spectrum. Hubble's orbit outside the distortion of Earth's atmosphere allows it to capture extremely high-resolution images with substantially lower background light than ground-based telescopes. It has recorded some of the most detailed visible light images, allowing a deep view into space. Many Hubble observations have led to breakthroughs in astrophysics, such as determining the rate of expansion of the universe.  

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