Wavelength, Frequency and Wave Speed
Wavelength, Frequency and Wave Speed
Terms to describe sound waves: Sound waves can be described by its
1. Wavelength 2. Frequency 3. Time period 4. Amplitude 5. Speed
Amplitude: The maximum displacement of the particles of the medium from their original mean positions on passing a wave through the medium is called amplitude of the wave. It is used to describe the size of the wave. It is usually denoted by the letter A. Its SI unit is metre. The amplitude of a wave is same as the amplitude of the vibrating body producing the wave.
Wavelength: The distance between the two consecutive compressions (C) or two consecutive rarefactions (R) is called the wavelength. Wavelength is the minimum distance in which a sound wave repeats itself. In other words, it is the combined length of a compression and an adjacent rarefaction. It is represented by a Greek letter lambda ‘λ’. Its SI unit is metre (m).
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Frequency: The number of complete waves (or oscillations) produced in one second is called frequency of the wave. It is the number of vibrations that occur per second. If we can count the number of the compressions or rarefactions that cross us per unit time, we will get the frequency of sound wave. The frequency of a wave is fixed and does not change even when it passes through different substances. It is denoted by ‘ν’ (Greek letter, nu). Its SI unit is hertz (symbol, Hz) named in honour of Heinrich Rudolf Hertz who discovered photoelectric effect.
Time Period: The time taken by two consecutive compressions or rarefactions to cross a fixed point is called the time period of the wave. In other words, the time required to produce one complete wave (or oscillations) is called time period of the Wave. It is denoted by symbol T. Its SI unit is second (s). The time period of a wave is the reciprocal of its frequency,
Speed: The distance travelled by a wave in one second is called speed of the wave or velocity of the wave. Under the same physical conditions, the speed of sound remains same for all frequencies. It is represented by letter v. Its SI unit is metre per second (rn/s). Relationship between speed, frequency and wavelength of a wave:
A wave of frequency 1000 Hz travels between X and Y, a distance of 600 m in 2 sec. How many wavelengths are there in distance XY? | |||
| Right Option : B | |||
| View Explanation | |||
The frequency of a wave traveling at a speed of 500m/sec is 25 Hz. It time peroid is __________________________ | |||
| Right Option : D | |||
| View Explanation | |||
A 440 Hz sound wave travels with a speed of 340 m/s. what is the wavelength of the wave ? | |||
| Right Option : B | |||
| View Explanation |
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Third consective year,my ward is in Abhyas with nice experience of admin and transport support.Educational standard of the institute recumbent at satisfactory level. One thing would live to bring in notice that last year study books was distributed after half of the session was over,though study ...
Ayan Ghosh
8thIn terms of methodology I want to say that institute provides expert guidence and results oriented monitering supplements by requsite study material along with regular tests which help the students to improve their education skills.The techniques of providing education helps the students to asses...
Aman Kumar Shrivastava
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Hridey Preet
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Manish Kumar
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7thAbhyas institute is one of the best coaching institute in the vicinity of Ambala Cantt area. The teachers of the institute are well experienced and very helpful in solving the problems of the students.The good thing of the institute is that it is providing extra classes for the students who are w...
Aman Kumar Shrivastava
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10thAbhyas institute is one of the best coaching institute in the vicinity of Ambala cantt.The institute provides good and quality education to the students.The teachers are well experienced and are very helpful in solving the problems. The major advantages of the institute is extra classes for weak...
Shreya Shrivastava
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10thMy experience with Abhyas Academy has been very good. When I was not in Abhyas whenever teacher ask questions I could not speak it confidently but when I came in Abhyas, my speaking skills developed and now I am the first one to give the answer of teachers question.
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