Question

The ratio of e/m of aproton to that of an alpha particle is

1:1 ,
1:4,
1:2,
1:1/4

Answer 1

@aaronq

Answer 2

An \(\alpha\) particle is 2 protons and 2 neutrons.. not sure what "e/m" means

Answer 3

Caherge to mass ration is e/m .

Answer 4

Charge *

Answer 5

i've never seen "e" as charge. it's usually "z", or "q".

Answer 6

@zpupster Solve it please ..

Answer 7

you don't need to use math, it's simple.

Mass of proton 1, mass of alpha particle 4

same charge for both

Answer 8

How both have Same charge ?

Answer 9

lol i mean, the \(\alpha\) particle obviously has a 2+ charge

Answer 10

Worked Example

What is the charge to mass ratio of a helium nucleus (alpha particle)?

We will assume that the proton and the neutrons have the same mass, 1.67 × 10-27 kg.



In a helium nucleus, there are 2 protons and 2 neutrons, making up 4 nucleons.



Charge to mass ratio = 2 × 1.6 × 10-19 C
4 × 1.67 × 10-27 kg
= 4.85 × 107 C kg-1

http://www.antonine-education.com/Pages/Physics_1/Particles/PP01/Particles_1.htm

Answer 11

\(\dfrac{\dfrac{1}{1}}{\dfrac{2}{4}}=\dfrac{1}{\dfrac{1}{2}}=2:1\) ?

it makes sense because the proton is 1:1, and the alpha p is 2:4, so it's half, though it's weird that that answer is not given.

Answer 12

yep

1:2

Answer 13

Ty :D