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CBSE Class 11-science Answered

FIND THE WAVELENGTH, FREQUENCY AND WAVE NUMBER OF A LIGHTWAVE WHOSE PERIOD IS 5 X 10-10s.

Asked by swarajtopper | 31 Jul, 2015, 07:06: PM
answered-by-expert Expert Answer
The time period 'T' is the time to complete one cycle.
 
begin mathsize 11px style Frequency equals straight nu equals 1 over straight T space equals space fraction numerator 1 over denominator 5 cross times 10 to the power of negative 10 end exponent space sec end fraction space equals space 0.2 cross times 10 to the power of 10 sec to the power of negative 1 end exponent Wavelength equals straight lambda space equals space straight c over straight nu space equals space fraction numerator 3 cross times 10 to the power of 8 space straight m divided by sec over denominator 0.2 cross times 10 to the power of 10 sec to the power of negative 1 end exponent end fraction space equals space 15 space cross times space 10 to the power of negative 2 end exponent space straight m Wavenumber equals space 1 over straight lambda equals space fraction numerator 1 over denominator 15 cross times 10 to the power of negative 2 end exponent space straight m end fraction equals space 6.66 space straight m to the power of negative 1 end exponent end style
Answered by Prachi Sawant | 02 Aug, 2015, 03:11: PM

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