Physics, 15.04.2020 00:39 savidgarcia303

An ambulance is driving towards the hospital at a velocity 94.0 km/h and emitting a steady 878-Hz sound from its siren. The sound reflects off the front of the hospital and is received by the same ambulance. In addition to it's own siren, the ambulance hears a shifted tone from the reflection at what frequency

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Answer from: paris4ever23

Complete Question

An ambulance is driving towards the hospital at a velocity 94.0 km/h and emitting a steady 878-Hz sound from its siren. The sound reflects off the front of the hospital and is received by the same ambulance. In addition to it's own siren, the ambulance hears a shifted tone from the reflection at what frequency? The speed of sound on this day is 343 m/s

The frequency is $f =1022.0 \ Hz$

Explanation:

From the question we are told that

The velocity of the ambulance $v = 94.0km/h = 94 *\frac{1000 m}{3600s} = 26 \ m/s$

The frequency emitted is $f_0 = 878 \ Hz$

The illustration of the process is shown on the first uploaded image

The frequency at the hospital wall due to Doppler's effect is mathematically repented as

$f_1 = f_o [\frac{v}{v-v_o} ]$

Now as seen the frequency at the ambulance is mathematically represented as

$f = f_1 [\frac{v+v_o}{v} ]$

Now substituting for f_w

$f = f_o [\frac{v+v_o}{v-v_o} ]$

Substituting value

$f = 878 * \frac{343 +26}{343 -26}$

$f =1022.0 \ Hz$

An ambulance is driving towards the hospital at a velocity 94.0 km/h and emitting a steady 878-Hz so

Answer from: mucciak8356

The frequency is 1022.68 Hz

Explanation:

According the Doppler`s effect, the frequency is:

$f=f_{o} (\frac{v+v_{o}}{v-v_{o} } )$

Where

fo = 878 Hz

v = velocity of sound = 343 m/s

v₀ = 94 km/h = 26.11 m/s

Replacing:

$f=878(\frac{343+26.11}{343-26.11} )=1022.68Hz$

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Neptune is the eighth planet from the sun. it was the first planet to get its existence predicted by mathematical calculations before it was actually seen through a telescope on sept. 23, 1846. irregularities in the orbit of uranus led french astronomer alexis bouvard to suggest that the gravitational pull from another celestial body might be responsible. german astronomer johann galle then relied on subsequent calculations to spot neptune via telescope. previously, astronomer galileo galilei sketched the planet, but he mistook it for a star due to its slow motion. in accordance with all the other planets seen in the sky, this new world was given a name from greek and roman mythology — neptune, the roman god of the sea.

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