In Rutherford's alpha particle cexperime...

In Rutherford's `alpha` particle cexperiment with thin gold faill, 8100 scattered `alpha`-particles per unit ara per unit area per minute were observed at an anle of `60^(@)` . Find the number of scattered `alpha`particles pr unit area per minut e at and angle of `120^(@)`

100

2025

32400

900

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