A quick Physics Question? about Waves

Physics
Tutor: None Selected Time limit: 1 Day

A transverse wave is found to have a distance of 9 cm from a trough to a crest, a frequency of 12 Hz, and a distance of 9 cm from a crest to the nearest trough. Determine the amplitude, period, and wavelength of such a wave.

Feb 18th, 2015

Wavelength =18cm

We start with a wave length, 1 cycle. It has three nodes and two anti nodes. One anti node is called the crest and the other is the trough. They are 1/2 cycle apart. So a full cycle, 1 wavelength, is 18 cm. 

Can't do the amplitude, not enough info. You gave us crest to trough twice, I suspect one of those should have been amplitude info. 
And as the length of a wave is 1 cycle, 12 lengths per second is the frequency. And 1/12 = seconds/length is the time the wave takes to travel that one cycle. We can write this as T = 1/F for the period. 

Feb 18th, 2015

Thank you for helping me but this is how it appears in the text book. Im not sure what to do. 

Feb 18th, 2015

Sorry but I can give you the full answer

Period = 1/frequency  So Period =  1/12 = 0.0833

Amplitude =D/f  So  9/12 

Wavelength=18

We start with a wave length, 1 cycle. It has three nodes and two anti nodes. One anti node is called the crest and the other is the trough. They are 1/2 cycle apart. So a full cycle, 1 wavelength, is 18 cm. 


Where D is the distance traveled by the wave and F is the frequency of the wave.

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 Period refers to the  time which it takes to do something. 

When an event occurs repeatedly, then we say that  the event is periodic and refer to the time for the event to repeat itself as the period.  

The period of a wave is the time for a particle on a medium to make one complete  vibrational cycle. 

Period, being a time, is measured in units of time such as seconds,  hours, days or years. 

http://isites.harvard.edu/fs/docs/icb.topic86897.files/October_16_Waves/waves_tutorial.pdf

AMPLITUDE = D/f

Where D is the distance traveled by the wave and F is the frequency of the wave.

The amplitude of a wave refers to the maximum amount of displacement  of a a particle on the medium from its rest position.

The maximum height observed in the wave is called as Amplitude. 

It is denoted by A and is given in decibels (dB)

Wavelength

The wavelength of a wave is simply the length of one complete wave cycle. 

reference

http://formulas.tutorvista.com/physics/amplitude-formula.html


Feb 18th, 2015

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