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san4es73 [151]
3 years ago
9

A red car and a blue car can move along the same straight one-lane road. Both cars can move only at one speed when they move (e.

g., 60 mph). The driver of the red car sounds his horn. In which one of the following situations does the driver of the blue car hear the highest horn frequency?a. Both cars are moving at the same speed, and they are moving apart.b. Both cars are moving in the same direction at the same speed.c. Both cars are moving at the same speed, and they are moving toward each other.d. The red car is moving toward the blue car, which is stationary.e. The blue car is moving toward the red car, which is stationary.
Physics
1 answer:
baherus [9]3 years ago
4 0

Answer:c

Explanation:

When both cars move towards each other with same speed , apparent frequency will be highest

this can also be explained by Doppler frequency Formula

f'=f\left ( \frac{v+v_o}{v-v_s}\right )

where f'=Apparent\ frequency

f=Original\ frequency

v_o=velocity\ of\ observer

v_s=velocity\ of\ source

v=velocity\ of\ sound

as denominator is smaller than Numerator therefore apparent frequency will be greater

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Explanation:

The electromagnetic spectrum is the distribution of radiation due to the different frequencies at which it radiates and its different intensitie. That radiation is formed by electromagnetic waves, which are transverse waves formed by an electric field and a magnetic field perpendicular to it.

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<em>a) Find the time it took for his voice to reach the Earth via radio waves.</em>

To know the time that took for Neil Armstrong's voice to reach the Earth via radio waves, the following equation can be used:

c = \frac{d}{t}  (1)

Where v is the speed of light, d is the distance and t is the time.

Notice that t can be isolated from equation 1.

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t = \frac{3.85x10^{8} m}{3x10^{8}m/s}

t = 1.28s

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<em>b) Determine the minimum time that will be required for a message from Mars to reach the Earth via radio waves.</em>

The distance from the Earth to the Mars at its closest approach is 5.76x10^{10}m, therefore.

t = \frac{5.76x10^{10}m}{3x10^{8}m/s}

t = 192s

Hence, the minimum time that will be required for a message from Mars to reach the Earth via radio waves is 192 seconds.

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