Find the De-broglie wavelength associated with hydrogen molecule moving with thermal velocity of 3km/s ?

You can find I using h/mv
h=6.6? 10^-34m/s
And mass of electron = 9.9 ? 10-?? Kg
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.66Armstrong

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Lambda=h/mv=6.6×10^-34/ 2×1.67×10^-27×3×10^3= .66A
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