Physics
Grade-8
Easy
Question
A sound wave of wavelength 200 mm has a frequency of 2 kHz. Its speed is ____ m/s.
Hint:
When a sound wave of wavelength 200 mm has a frequency of 2 kHz, its speed is 400 m/s.
The correct answer is: 400
- The speed of a sound wave that has a particular wavelength and frequency can be calculated by the formula speed= fλ.
- The given frequency is 2 kHz and the wavelength is 200 mm.
- Speed = fλ = 2x 200
- The speed of sound = 400 m/s.
Related Questions to study
Physics
A sound wave traveling at a speed of 500 m/s has a frequency of 50 Hz. Its wavelength is ___ m.
A sound wave traveling at a speed of 500 m/s has a frequency of 50 Hz. Its wavelength is ___ m.
PhysicsGrade-8
Physics
1.65 kHz = ____ Hz.
1.65 kHz = ____ Hz.
PhysicsGrade-8
Physics
In which of the following mediums does the sound propagate at the lowest speed?
In which of the following mediums does the sound propagate at the lowest speed?
PhysicsGrade-8
Physics
At a particular temperature, the speed of sound in a medium was found to be 450 m/s. The speed of sound in that medium will be _____ if the temperature of the medium is decreased?
At a particular temperature, the speed of sound in a medium was found to be 450 m/s. The speed of sound in that medium will be _____ if the temperature of the medium is decreased?
PhysicsGrade-8
Physics
Which of the following sound waves shown would move faster in the air medium?
Which of the following sound waves shown would move faster in the air medium?
PhysicsGrade-8
Physics
Sonic boom is a phenomenon caused by the sound emitting objects moving at _____.
Sonic boom is a phenomenon caused by the sound emitting objects moving at _____.
PhysicsGrade-8
Physics
The distance covered by a rarefaction of a sound wave per unit time is _____.
The distance covered by a rarefaction of a sound wave per unit time is _____.
PhysicsGrade-8
Physics
When a sound producing object moves at a speed greater than that of sound in a medium, it produces _____.
When a sound producing object moves at a speed greater than that of sound in a medium, it produces _____.
PhysicsGrade-8
Physics
An object is said to be moving at a supersonic speed when its speed is ____ the speed of sound in a medium.
An object is said to be moving at a supersonic speed when its speed is ____ the speed of sound in a medium.
PhysicsGrade-8
Physics
Which of the following does the speed of sound in a medium not depend on?
Which of the following does the speed of sound in a medium not depend on?
PhysicsGrade-8
Physics
As the temperature of a medium increases, the speed of sound in it ___.
As the temperature of a medium increases, the speed of sound in it ___.
PhysicsGrade-8
Physics
Speed of light ____ speed of sound.
Speed of light ____ speed of sound.
PhysicsGrade-8
Physics
1 kHz = ____Hz.
1 kHz = ____Hz.
PhysicsGrade-8
Physics
The SI unit of speed of sound is ____.
The SI unit of speed of sound is ____.
PhysicsGrade-8
Physics
The audible frequency range of an average human ear is ____.
- Sound which has frequency less than 20Hz is called infrasound.
- Sound which has frequency more than 20KHz is called Ultrasound.
The audible frequency range of an average human ear is ____.
PhysicsGrade-8
- Sound which has frequency less than 20Hz is called infrasound.
- Sound which has frequency more than 20KHz is called Ultrasound.
