An electron of mass m and a photon have same energy E . The ratio of de-Broglie wavelengths associated with them is :

1. A. 1 c ( E 2m ) 1/2
2. B. ( E 2m ) 1/2
3. C. c(2mE) 1/2
4. D. 1 xc ( 2m E ) 1/2

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