Answer:
We know, \[\lambda =\frac{h}{m\upsilon }\]
\[m=\frac{h}{\lambda \upsilon
}=\frac{6.26\times {{10}^{-34}}Js}{3.6\times {{10}^{-10}}m\times 3\times
{{10}^{8}}m\,{{\sec }^{-1}}}\]
\[=6.135\times {{10}^{-33}}kg\]
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