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vovikov84 [41]
3 years ago
13

When a police officer receives information that you are speeding in your vehicle, she is using the ______________ of the wave to

measure the Doppler Effect.
a. amplitude
b. refraction
c. frequency
d. resonance
Physics
1 answer:
Alex3 years ago
6 0
I think the corect answer would be C. When a police officer receives information that you are speeding in your vehicle, she is using the frequency of the wave to measure the Doppler Effect. As the speed of a vehicle increases, the greater the change of the frequency of the waves would be transmitted to the radar guns which is being used by the police officer. Doppler effect is an effect that is observed in sound and light waves as these waves move away or to the direction of the observer. This is being used in many applications like in astronomy, weather balloons, the radar guns,and for underwater researches.
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[A] Write an expression for the equivalent resistance of three resistors connected in parallel.[ no derivation needed]
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Answer:

1) R1 + ((R2 × R3)/(R2 + R3))

2) 0.5 A

3) 3.6 V

Explanation:

1) We can see that resistors R2 and R3 are in parallel.

Formula for sum of parallel resistors; 1/Rt = 1/R2 + 1/R3

Making Rt the subject gives;

Rt = (R2 × R3)/(R2 + R3)

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2) R_total = R1 + ((R2 × R3)/(R2 + R3))

We are given;

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R3 = 12 Ω

R_total = 7.2 + ((8 × 12)/(8 + 12))

R_total = 7.2 + 4.8

R_total = 12 Ω

Formula for current is;

I = V/R

I = 6/12

I = 0.5 A

3) since current through the circuit is 0.5 and R1 is 7.2 Ω.

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V = IR = 0.5 × 7.2 = 3.6 V

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