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mass of an electron

the mass of an electron in most of the old textbooks is given as 1/1840

however in the latest NAS make the grade bk, it is given as 1/1860

which value is the correct value?
cud it b a typing error?

plz help

thanks
Reply 1
Avatar for Knogle
Knogle
16
I'm pretty sure that it's a typing error. In fact, accurately, the mass of an electron is 1/183x amu.
Reply 2
Avatar for sandra
sandra
OP
1
Knogle
I'm pretty sure that it's a typing error. In fact, accurately, the mass of an electron is 1/183x amu.


so, what value shld b used if asked in the exam ?
Reply 3
Avatar for *Liana*
*Liana*
1
It's negligible, or 0, really...

Take the value from the textbook though, if there's controversy, this is what examiners look at, not revision guides!
Reply 4
Avatar for b33jal
b33jal
i'd make it 1/1840 in an exam -we were discussing it in physics (though in physics, it's taken as zero in the exam)
Reply 5
Avatar for Dhesi
Dhesi
2
I just googled it and got:

electron mass = 9.10938188 × 10-31 kilograms

Mike
Reply 6
Avatar for Aired
Aired
1
Giving the mass in kilograms is a bit strange, lol.
Reply 7
Avatar for Profesh
Profesh
20
1/1840 of what, exactly?
1/1836 from wot i lernt in chem
:smile:
Reply 9
Avatar for Profesh
Profesh
20
sparkleyez
1/1836 from wot i lernt in chem
:smile:


Of what; an elephant's right-testicle?
Reply 10
Avatar for Esquire
Esquire
1
1/1840 of what, exactly?

Of the mass of a proton, obviously.:biggrin:
Reply 11
Avatar for sandra
sandra
OP
1
Profesh
Of what; an elephant's right-testicle?


no, the left one! (just kidding:p: )

thanks for the help guys, i think im gonna go with 1840, that one seems to b the most common
it's 1/1836 of an atomic mass unit - based on the scale where the 12C isotope is assigned a mass of exactly 12 units.
it's 1/1836. Thus the next approximation is 1/1840.

However this is the rest mass of an electron
Reply 14
Avatar for ArVi
ArVi
13
It's mass is: (1/1836) * u

Where u is the atomic mass unit (1.66 x 10^-27 kg)

So the (rest) mass of an electron is: 9.1 x 10^-31 kg
Reply 15
Avatar for sandra
sandra
OP
1
ArVi
It's mass is: (1/1836) * u

Where u is the atomic mass unit (1.66 x 10^-27 kg)

So the (rest) mass of an electron is: 9.1 x 10^-31 kg



thanks arvi:smile:

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