Examples of Securities Questions
Doppler and Complete Discussion – Have you received material about effects
Doppler at school?
The Doppler effect is a change in the frequency of sound or light waves caused by the relative motion between the wave source and the wave receiver.
As study material, this article contains examples of Doppler Effect questions which have been accompanied by discussions to make it easier for you.
Use of the Doppler Effect Formula
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Meanwhile, the formula for calculating the Doppler Effect for sound and light waves is as follows:
1. Doppler Effect for Sound Waves
a. For sources
approaching (movement towards the recipient):
b. For sources
the away (movement away 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 (for example, air),
is the speed of the sound source relative to the medium,
is the speed of the wave receiver (observer) relative to the medium.
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2. Doppler Effect for Light Waves
a. For light
approaching (movement towards the observer):
b. For light
which moves away (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 a vacuum,
is the speed of the light source relative to the medium,
is the observer’s speed with respect to the medium.
Example Practice Questions on the Doppler Effect
Example of Doppler Effect Questions – Part 1
Question 1:
A car moving at a speed of 30 m/s approaches
observer on the side of the road. The car makes a sound with
frequency 500 Hz.
If the speed of sound is 343 m/s, calculate the frequency
what the observer hears.
Discussion:
So, the frequency heard by the observer is approx
522 Hz.
Question 2
A sound source moves away from the observer by
speed 20 m/s. If the frequency of the sound source is 1000 Hz and the speed
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 is moving away from Earth at 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 airplane is moving at a speed approaching Approach Control Unit on land. Airplanes produce sound with a frequency of .
If the speed of sound is , what frequency does the officer hear?
Discussion:
The frequency heard by officers is approx.
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Doppler Effect Example Questions – Part 2
Question 5
Detected light source moving away at speed .
It is known that the wavelength of light is , then what is the wavelength?
Discussion:
The wavelength of the light source is approx.
Question 6
Radar captured the submarine moving towards the sea surface at a speed of .
The speed of sound in water is and submarines make sound with a frequency of .
What frequencies do observers hear on the surface?
sea?
Discussion:
Question 7
It is predicted that a galaxy is moving away from an observer on Earth at a speed of .
The light received by the observer has an initial wavelength. Calculate the wavelength that NASA can later observe.
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 sound with a frequency of .
If the speed of sound is , calculate the frequency heard!
Discussion:
Example of Doppler Effect Questions – Part 3
Question 9
The lights flash with a frequency on a vehicle moving toward 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 sound with a frequency of .
If the speed of sound is , what frequencies can be heard?
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 approximately .
Question 12
The helicopter is moving towards a pedestrian at a speed of .
If the frequency of 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.
Example of Doppler Effect Questions – Part 4
Question 13
The meteor was detected moving closer to 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 is moving 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 the flashes heard?
Discussion:
Question 16
At an airport there is an airplane that is traveling at speed towards the airport. Sound sources on airplanes produce sound with a frequency of .
If the speed of sound is , what frequency will passengers hear at the airport?
Discussion:
So, the frequency heard by passengers on the ground is around (1094.12 , text{Hz}).
Example of 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 motorbike moves at speed approaching pedestrians on the side of the road.
The motor produces 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 is moving towards an observer with a speed of .
The frequency of sound produced by the helicopter is , and the speed of sound is . What frequencies does the observer hear?
Discussion:
Question 20
Light energy is known to move closer to the governor’s office at a speed of .
If the wavelength of light is , what wavelength can be seen?
Discussion:
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Closing
What is Mamikos’ article about examples of Doppler Effect questions and
is the explanation easy for you to understand?
Hopefully this article is useful in increasing your understanding of the Doppler Effect, OK?
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2024-01-16 03:10:35
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