mass spec calculation a level question

53Cr+ ion travels along flight tube of lengh 1.25m
Ion has KE 1.102x10^-13

KE=mv^2/2

How long does it take for ion to reach detetctor.
Avagadgro constant 6.022x10^23

I got 7.899x10^-7 is this correct?

Reply 1

aque1408

Original post by anoymous77

I got the same answer!

Reply 2

th3hara

how do you work this out???

Reply 3

TypicalNerd

Original post by th3hara

how do you work this out???

You do realise this is a two year old thread, right?

Though if you still do want to know, you should know of the equation v = d/t (speed in m s^-1 = length of flight tube in metres divided by time in seconds). Substitute it into the equation KE = 1/2 mv^2 and rearrange it for t.

You should also know that the mass of one ion in kg is the ion’s relative mass divided by Avogadro’s constant and then divided again by 1000.

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