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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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`lambda = 0.499 xx10^(-11) m`
` = 4.99 xx 10^(-12) m`
`= 4.99 ` pm `( :' 1` pm `= 10^(-12)m )`
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