Examples of securities questions
Doppler and full discussion – You have received material on the effects
Doppler at school?
The Doppler effect is a change in the frequency of sound or light waves caused by relative motion between the wave source and the wave receiver.
As study material, this article contains sample Doppler effect questions that have been accompanied by discussions to make the task easier for you.
Using the Doppler effect formula
Canva/Images by @Alexander
Meanwhile, the formula for calculating the Doppler effect for sound and light waves is as follows:
1. Doppler effect for sound waves
A. For the sources
approach (movement towards the recipient):
B. For the sources
estrangement (removal from the recipient):
Where:
is the frequency detected by the receiver,
is the original frequency of the sound wave,
is the speed of sound in the medium (e.g. air),
is the speed of the sound source with respect to the medium,
is the speed of the wave receiver (observer) with respect to the medium.
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2. Doppler effect for light waves
A. For the light
approach (movement towards the observer):
B. For the light
receding (movement away from the observer):
Where:
is the shift in frequency (or wavelength) detected by the observer,
is the original frequency of the light wave,
is the speed of light in vacuum,
is the speed of the light source with respect to the medium,
is the speed of the observer with respect to the medium.
Examples of practice questions on the Doppler effect
Sample Doppler Effect Questions – Part 1
Question 1:
A car moving with a speed of 30 m/s approaches
observer on the side of the road. The car makes a sound
frequency 500 Hz.
If the speed of sound is 343 m/s, calculate the frequency
what the observer feels.
Discussion:
Thus, the frequency heard by the observer is approx
522Hz.
Question 2
A sound source moves away from the observer
speed 20 m/sec. If the frequency of the sound source is 1000 Hz and the speed
the sound is 343 m/s.
What frequencies does the observer hear?
Discussion:
The frequency heard by observers is approximately 1064
Hz.
Question 3
A star moves away from Earth with a speed of .
If the wavelength of starlight is , what wavelength can be observed on Earth?
Discussion:
The wavelength observed by an observer on Earth is approx.
Question 4
It is known that the aircraft is moving at an approaching speed Approach control unit on earth. Airplanes produce sounds with a frequency of .
If the speed of sound is , what frequency does the officer hear?
Discussion:
The frequency heard by the officers is approx.
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Doppler Effect Sample Questions – Part 2
Question 5
Fast moving light source detected.
It is known that the wavelength of light is , so what is the wavelength?
Discussion:
The wavelength of the light source is approx.
Question 6
The radar caught the submarine as it moved towards the sea surface at a speed of .
The speed of sound in water is and submarines emit sounds with a frequency of .
What frequencies do observers on the surface hear?
sea?
Discussion:
Question 7
A galaxy is predicted to be moving away from an observer on Earth at a speed of .
The light received by the observer has an initial wavelength. Calculate the wavelength NASA will be able to observe next.
Discussion:
The wavelength observed by NASA is approx.
Question 8
You can see a car approaching at speed. The sound source in the car produces a sound with a frequency of .
If the speed of sound is , calculate the frequency heard!
Discussion:
Sample Doppler Effect Questions – Part 3
Question 9
The lights flash with a frequency on a vehicle moving towards an observer at a speed of .
Calculate the frequency of the flashes heard, if the speed of light is !
Discussion:
Question 10
A hot air balloon is seen moving away at a speed of . The sound source inside the hot air balloon produces a sound with a frequency of .
If the speed of sound is , what frequencies can you hear?
Discussion:
Question 11
The rocket is moving towards the space station at a speed of .
The frequency of the radio waves emitted by the rocket is:
What frequencies will the space station hear? .
Discussion:
So, the frequency that the space station will hear is about .
Question 12
The helicopter is moving towards a pedestrian at a speed of .
If the frequency of the sound produced by a helicopter is and the speed of sound is , what is the frequency heard by pedestrians?
Discussion:
The frequency heard by pedestrians is approx.
Sample Doppler Effect Questions – Part 4
Question 13
The meteor was detected approaching the earth at a speed of .
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The wavelength of light received by the observer is . Calculate the wavelength of the galaxy.
Discussion:
The wavelength of this galaxy is approx.
Question 14
A ship moves away from the observer at a speed of .
When the frequency of the sound produced by the ship is and the speed of sound in the water is , what frequency does the observer hear?
Discussion:
Question 15
A light is seen flashing with a frequency on a vehicle moving away from a building at a speed of .
If the speed of light is , what is the frequency of flashes heard?
Discussion:
Question 16
At an airport there is a plane traveling at full speed towards the airport. Sound sources on airplanes produce sound with a frequency of .
If the speed of sound is , what frequency will passengers at the airport hear?
Discussion:
Thus, the frequency heard by passengers on the ground is around \(1094.12 \, \text{Hz}\).
Sample Doppler Effect Questions – Part 5
Question 17
The small comet was seen moving away from the mountains at a speed of .
The wavelength of light received by the observer is . Calculate the wavelength of the comet.
Discussion:
The wavelength of the comet is approx.
Question 18
The motorcycle moves at speed approaching pedestrians on the side of the road.
The motor produces a sound with a frequency of . If the speed of sound is , calculate the frequency heard by the pedestrian.
Discussion:
Therefore, the frequency heard by pedestrians is .
Question 19
A helicopter moves towards an observer with a speed of .
The frequency of the sound produced by the helicopter is , and the speed of sound is . What frequencies does the observer hear?
Discussion:
Question 20
It is known that light energy approaches the governor’s office at a speed of .
If the wavelength of light is , what wavelength can be seen?
Discussion:
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Closure
What is Mamikos article on Doppler effect question examples and
Is the explanation easy to understand?
We hope this article is helpful in increasing your understanding of the Doppler effect, okay?
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2024-01-16 03:10:35
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