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:
If the amplitude of sound is doubled and the frequency reduced to one fourth, the intensity of sound at the same point will be _________________ | |||
| Right Option : C | |||
| View Explanation | |||
A tuning fork sends sound waves in air. If the temperature of air increases, which of the following parameters will change ? | |||
| Right Option : C | |||
| View Explanation | |||
What is the speed of a 150 Hz wave whose wavelength is measured to be 0.30 m? | |||
| Right Option : A | |||
| View Explanation | |||
Students / Parents Reviews [20]
I have spent a wonderful time in Abhyas academy. It has made my reasoning more apt, English more stronger and Maths an interesting subject for me. It has given me a habbit of self studying
Yatharthi Sharma
10thUsually we see institutes offering objective based learning which usually causes a lag behind in subjective examinations which is the pattern followed by schools. I think it is really a work of planning to make us students grab the advantages of modes of examination, Objective Subjective and Onli...
Anika Saxena
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
10thAbhyas 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
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Shreya Shrivastava
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Om Umang
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Cheshta
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Barkha Arora
10thAbhyas 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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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.
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