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ICSE Class 10 Physics 2018 Paper

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Question : 8 of 78
Marks: +1, -0
Which of the above wavelengths has a higher frequency?
Solution:  
Wavelength 4000A˚4000\,\text{Å} has a higher frequency. Since, f=vλf=\frac{v}{\lambda} , If vv is constant, then f1λf\propto\frac{1}{\lambda} . So less is the wavelength, more is the frequency.
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