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A observer is standing 10 m from a road on which a vehicle is approaching him at a speed of 96 /hr when the vehicle is 50 m away from him, it blows a horn of frequency 8000 Hz what will be the frequency observed by the observer?
Correct answer is '8668'. Can you explain this answer?
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A observer is standing 10 m from a road on which a vehicle is approach...
= 8668 Hz
The correct answer is: 8668
Most Upvoted Answer
A observer is standing 10 m from a road on which a vehicle is approach...
Given:
- Distance between the observer and the road, d = 10 m
- Speed of the vehicle, v = 96 km/hr = 96 m/s
- Distance between the vehicle and the observer when the horn is blown, D = 50 m
- Frequency of the horn, f = 8000 Hz
Formula:
The observed frequency (f') of a sound wave emitted by a moving source can be calculated using the formula:
f' = f * (v + v₀) / (v + vₒ)
Where:
- f' is the observed frequency
- f is the actual frequency of the sound wave
- v is the speed of sound in air (approximately 343 m/s)
- v₀ is the speed of the observer relative to the medium (positive if the observer is moving towards the source, negative if moving away)
Calculation:
1. Convert the speed of the vehicle from km/hr to m/s:
v = 96 km/hr * (1000 m/km) * (1 hr/3600 s) = 26.67 m/s
2. Calculate the speed of the observer relative to the medium:
v₀ = v - 0 = 26.67 m/s - 0 m/s = 26.67 m/s (since the observer is stationary)
3. Substitute the values into the formula to find the observed frequency:
f' = 8000 Hz * (343 m/s + 26.67 m/s) / (343 m/s + 0 m/s) = 8668 Hz
Answer:
The frequency observed by the observer is 8668 Hz.
- Distance between the observer and the road, d = 10 m
- Speed of the vehicle, v = 96 km/hr = 96 m/s
- Distance between the vehicle and the observer when the horn is blown, D = 50 m
- Frequency of the horn, f = 8000 Hz
Formula:
The observed frequency (f') of a sound wave emitted by a moving source can be calculated using the formula:
f' = f * (v + v₀) / (v + vₒ)
Where:
- f' is the observed frequency
- f is the actual frequency of the sound wave
- v is the speed of sound in air (approximately 343 m/s)
- v₀ is the speed of the observer relative to the medium (positive if the observer is moving towards the source, negative if moving away)
Calculation:
1. Convert the speed of the vehicle from km/hr to m/s:
v = 96 km/hr * (1000 m/km) * (1 hr/3600 s) = 26.67 m/s
2. Calculate the speed of the observer relative to the medium:
v₀ = v - 0 = 26.67 m/s - 0 m/s = 26.67 m/s (since the observer is stationary)
3. Substitute the values into the formula to find the observed frequency:
f' = 8000 Hz * (343 m/s + 26.67 m/s) / (343 m/s + 0 m/s) = 8668 Hz
Answer:
The frequency observed by the observer is 8668 Hz.
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A observer is standing 10 m from a road on which a vehicle is approaching him at a speed of 96 /hr when the vehicle is 50 m away from him, it blows a horn of frequency 8000 Hz what will be the frequency observed by the observer?Correct answer is '8668'. Can you explain this answer?
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A observer is standing 10 m from a road on which a vehicle is approaching him at a speed of 96 /hr when the vehicle is 50 m away from him, it blows a horn of frequency 8000 Hz what will be the frequency observed by the observer?Correct answer is '8668'. Can you explain this answer? for Physics 2024 is part of Physics preparation. The Question and answers have been prepared according to the Physics exam syllabus. Information about A observer is standing 10 m from a road on which a vehicle is approaching him at a speed of 96 /hr when the vehicle is 50 m away from him, it blows a horn of frequency 8000 Hz what will be the frequency observed by the observer?Correct answer is '8668'. Can you explain this answer? covers all topics & solutions for Physics 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A observer is standing 10 m from a road on which a vehicle is approaching him at a speed of 96 /hr when the vehicle is 50 m away from him, it blows a horn of frequency 8000 Hz what will be the frequency observed by the observer?Correct answer is '8668'. Can you explain this answer?.
A observer is standing 10 m from a road on which a vehicle is approaching him at a speed of 96 /hr when the vehicle is 50 m away from him, it blows a horn of frequency 8000 Hz what will be the frequency observed by the observer?Correct answer is '8668'. Can you explain this answer? for Physics 2024 is part of Physics preparation. The Question and answers have been prepared according to the Physics exam syllabus. Information about A observer is standing 10 m from a road on which a vehicle is approaching him at a speed of 96 /hr when the vehicle is 50 m away from him, it blows a horn of frequency 8000 Hz what will be the frequency observed by the observer?Correct answer is '8668'. Can you explain this answer? covers all topics & solutions for Physics 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A observer is standing 10 m from a road on which a vehicle is approaching him at a speed of 96 /hr when the vehicle is 50 m away from him, it blows a horn of frequency 8000 Hz what will be the frequency observed by the observer?Correct answer is '8668'. Can you explain this answer?.
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