A n a l p h a p a r t i c l e s t r i k e s a n a t o m a t r e s t . T h e d e B r o g l i e w a v e l e n g t h o f t h e α p a r t i c l e i n c r e a s e s f r o m λ t o 3 λ . I f t h e d e - B r o g I i e w a v e l e n g t h o f t h e a t o m i s 3 λ 2 2 t h e n c a l c u l a t e t h e m a s s o f t h e a t o m . ( A s s u m e t h a t c o l l i s i o n i s e l a s t i c ) . ( 1 ) 2 a m u ( 2 ) 3 a m u ( 3 ) 4 a m u ( 4 ) 8 a m u Share with your friends Share 5 Vijay Shankar Yadav answered this Dear Student, We have αP=h3λ/222ME=22h3λ---1here E=Pα122mα-Pα222mα=h22mαλ211-19=4h29mαλ2from 1 2M4h29mαλ2=8h29λ2M=mα=4amu Regards 2 View Full Answer