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What is the de Broglie wavelength associ...

What is the de Broglie wavelength associated with (a) an electron moving with a speed of `5.4xx10^(6) m//s`, and (b) a ball of mass 150 g travelling at `30.0 m//s`?

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(a) For the electron:
Mass `m=9.11xx10^(-31)` kg speed `v=5.4xx10^(6)m//s`.Then momentum `p=mv=9.11xx10^(-31)(kg)xx5.4xx10^(6)m//s, p=4.92xx10^(-2)kg m//s` de-brogile wave length.
`lambda=(h)/(p)`
`=(6.63xx10^(-34)Js)/(4.92xx10^(-24)kgm//s)`
`lambda=0.135nm`.
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