Physics, 20.08.2019 22:30 googoo4

Atrain is moving parallel to a highway with a constant speed of 19.5 m/s. a car is traveling in the same direction as the train with a speed of 40.5 m/s. the car horn sounds at a frequency of 512 hz, and the train whistle sounds at a frequency of 322 hz. (a) when the car is behind the train, what frequency does an occupant of the car observe for the train whistle? hz (b) after the car passes and is in front of the train, what frequency does a train passenger observe for the car horn?

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Answer from: izzyp619

(a). The frequency of the car is 990.76 Hz.

(b). The frequency of the train is 265.48 Hz.

Explanation:

Given that,

Speed of train = 19.5 m/s

Speed of car = 40.5 m/s

Frequency of car's horn = 512 Hz

Frequency of train's whistle = 322 Hz

(a). When the car is behind the train,

We need to calculate the frequency of the car

Using formula of frequency

$f_{c}=f_{t}(1+\dfrac{v_{c}}{v_{t}})$

Put the value into the formula

$f_{c}=322\times(1+\dfrac{40.5}{19.5})$

$f_{c}=990.76\ Hz$

(b). After the car passes and is in front of the train,

We need to calculate the frequency of train

Using formula of frequency

$f_{t}=f_{c}(1+\dfrac{v_{c}}{v_{t}})$

Put the value into the formula

$f_{t}=512\times(1-\dfrac{19.5}{40.5})$

$f_{c}=265.48\ Hz$

Hence, (a). The frequency of the car is 990.76 Hz.

(b). The frequency of the train is 265.48 Hz.

Answer from: Quest

i sometimes feel that way too. i feel that i should hurt someone because they hurt me, but i wouldnt do it. that would make things so much worse i have so much experience with this stuff

explanation:

Answer from: Quest

scattering of light by tiny particles in air to produce the colors we see on sky, is dependent on the following factors:

(i) wavelength of light

(ii) size of the scattering particle

(iii) distance traveled by light through the atmosphere.

according to rayleigh's law of scattering, the amount of scattering is inversely proportional to the fourth power of its wavelength. shorter the wavelength, greater is its scattering. hence violet/blue light is scattered more than red.

sun's light is a composite light ( visible light) with wavelengths in the range 400 nm (violet) to 700 nm (red). as sunlight passes through our atmosphere, the molecules of air scatter light according to their wavelengths. during sunrise and sunset, the sun's position is below the horizon. hence light from the sun travels a greater distance in the atmosphere when compared to its position a noon.

as sunlight enters the earth's atmosphere, blue light is scattered away and at the end of its journey in the sky, only red and orange wavelengths remain in the beam.

hence at sunrise and sunset, the sky appears reddish orange.

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Atrain is moving parallel to a highway with a constant speed of 19.5 m/s. a car is traveling in the...

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