Wavelength, Frequency and Wave Speed
Wavelength, Frequency and Wave Speed
Characteristics of Sound: Sound travels in the form of a wave. Waves are characterized by three basic quantities. They are frequency, speed, and amplitude. Two of the main characteristics of sound are pitch and loudness, which in turn are determined by the frequency and amplitude of the wave, respectively. Therefore, to understand what pitch and loudness mean, we will first need to study the characteristics of waves.
Amplitude: The maximum displacement of the bob from the mean position during oscillation is called the amplitude of the oscillation. The maximum displacement occurs when the bob is at positions B and C. The position where it comes to stop is called mean position.
.jpg)
.png)
Time period: When the bob moves from one position and comes back to the same position (moving in the same direction), it is said to complete one oscillation. The time taken to complete one oscillation is called the time period of the oscillation. It is measured in seconds.
Frequency: The number of oscillations per second is called the frequency of oscillation. Faster the vibration of the source, higher is the frequency and higher is the pitch. A pitch sound is called a shrill sound. A low pitch sound is called a hoarse sound. The, SI unit of frquency is hertz .One hertz is the same as one cycle oer second.
We can say that
Wave speed : Wave speed can be defined as the distance covered by a wave in one second.
Therefore,
Relation between wavelength, frequency and wave speed
The region of high density corresponds to compressions, and the region of the low density correspond to rarefraction. At time A is the one of the place where compression is maximum.As time passes, this maximum compression shifts in the direction of propagation of the wave. At time
it reaches C.
Now, the distance AC = distance between consecutive maximum compressions = wavelength
Also, the time = time period, T.
So, the sound wave moves a distance in time T. Thus, the wave speed is
Here, V denotes wave speed , denotes wavelength and T denotes time taken
As frequency connecting V and
in terms of the frequency v
V = v
or, wave speed = frequency wavelength
It hold true for any periodic wave, both for transverse or longitudinal waves.
The pitch of sound is determined by the _______ of vibration. | |||
| Right Option : A | |||
| View Explanation | |||
| |||||||||||||||
| Right Option : A | |||||||||||||||
| View Explanation | |||||||||||||||
Speed of sound in air at room tempereature is | |||
| Right Option : A | |||
| View Explanation | |||
Students / Parents Reviews [10]
Being a parent, I saw my daughter improvement in her studies by seeing a good result in all day to day compititive exam TMO, NSO, IEO etc and as well as studies. I have got a fruitful result from my daughter.
Prisha Gupta
8thAbhyas Methodology is very good. It is based on according to student and each child manages accordingly to its properly. Methodology has improved the abilities of students to shine them in future.
Manish Kumar
10thIt was good as the experience because as we had come here we had been improved in a such envirnment created here.Extra is taught which is beneficial for future.
Eshan Arora
8thA marvelous experience with Abhyas. I am glad to share that my ward has achieved more than enough at the Ambala ABHYAS centre. Years have passed on and more and more he has gained. May the centre flourish and develop day by day by the grace of God.
Archit Segal
7thMy experience with Abhyas academy is very good. I did not think that my every subject coming here will be so strong. The main thing is that the online tests had made me learn here more things.
Hiya Gupta
8thMy experience was very good with Abhyas academy. I am studying here from 6th class and I am satisfied by its results in my life. I improved a lot here ahead of school syllabus.
Ayan Ghosh
8thAbout Abhyas metholodology the teachers are very nice and hardworking toward students.The Centre Head Mrs Anu Sethi is also a brilliant teacher.Abhyas has taught me how to overcome problems and has always taken my doubts and suppoeted me.
Shreya Shrivastava
8thMy experience with Abhyas is very good. I have learnt many things here like vedic maths and reasoning also. Teachers here first take our doubts and then there are assignments to verify our weak points.
Shivam Rana
7thIt has a great methodology. Students here can get analysis to their test quickly.We can learn easily through PPTs and the testing methods are good. We know that where we have to practice
Barkha Arora
10thIt was a good experience with Abhyas Academy. I even faced problems in starting but slowly and steadily overcomed. Especially reasoning classes helped me a lot.
