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A beam of helium atoms moves with a velo...

A beam of helium atoms moves with a velocity of`2 xx 10^(4) ms^(-1)`. Find the wavelength of paritcles constituting with the beam .
Hint `:` Mass of helium atom `= ( 4)/( 6.022 xx 10^(23)) g`

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`lamda = 0.499 xx 10^(-11) m`
` = 4.99 xx 10 ^(-12) m`
` = 4.99 pm ( :. 1 pm = 10 ^(-12)m)`
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