A particle is travelling 4 time as fast as an electron. Assuming the ratio of de-Broglie wavelength of a particle to that of electron is 2 : 1, the mass of the particle is :
${1 \over {16}}$ times the mass of e$-$
8 times the mass of e$-$
16 times the mass of e$-$
${1 \over {8}}$ times the mass of e$-$
Solution
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