An electron (e,m) and photon have same e...

An electron (e,m) and photon have same energy E. Then the ratio `lambda_e : lambda_p` is?

`1/c (sqrt(E/(2m)))`

`1/c (sqrt(E/m))`

`2/c (sqrt(E/m))`

`1/2c (sqrt(E/m))`

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