it is easy:wavelength = planck's constant / mass x velocity

i will solve it 6.626 x 10^-34/9.1 x 10^-31 x 106

the answer is 0.00000686916 = 6.86916 x 10^-6

i take h = 6.63*10^-34 so this is difference in answer .but the value is so small its do not any matter .if value is small just see order of magnitude and before decimal integer and after decimal first integer.

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