Lowest Speed Nucleus for Acceleration: 9702 Physics Q40

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mutineer123
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Homework Statement



http://www.xtremepapers.com/CIE/International%20A%20And%20AS%20Level/9702%20-%20Physics/9702_s07_qp_1.pdf

question 40

Homework Equations





The Attempt at a Solution


I got D, because the heaviest should have the lowest speed. But I am wrong. dnt know why
 
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mutineer123 said:

Homework Statement



http://www.xtremepapers.com/CIE/International%20A%20And%20AS%20Level/9702%20-%20Physics/9702_s07_qp_1.pdf

question 40

Homework Equations



The Attempt at a Solution


I got D, because the heaviest should have the lowest speed. But I am wrong. dnt know why
How does the force on each nucleus compare ?
 


If they are all accelerated through the same voltage you should be able to get an expression for the kinetic energy they each gain using the atomic number then you should be able to get an expression for each speed