anonymous
  • anonymous
Question
Physics
  • Stacey Warren - Expert brainly.com
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
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anonymous
  • anonymous
@dan815
dan815
  • dan815
ok yep?

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dan815
  • dan815
what is the question
anonymous
  • anonymous
so when i put all the values in the calc i dont get excat answer as tht
dan815
  • dan815
http://www.wolframalpha.com/input/?i=4.14*10^-15+*3*10^8%2F2.55
dan815
  • dan815
seems to be right
anonymous
  • anonymous
no i mean the answer is right but this is what i get when i put in the excat value
arindameducationusc
  • arindameducationusc
what do you get?
anonymous
  • anonymous
4.8705*10^-7
arindameducationusc
  • arindameducationusc
okay lets do by this way.....
arindameducationusc
  • arindameducationusc
multiply by 4.14*3 . and in powers of 10, add -15 and 8, we get -7, isn't it
anonymous
  • anonymous
ok
arindameducationusc
  • arindameducationusc
now 4.14*3 we get 12.4, now divide it by 2.55.
arindameducationusc
  • arindameducationusc
so total we have 4.87 * 10^-7, isn't it? And you have a problem that it is 487, right?
anonymous
  • anonymous
ok
anonymous
  • anonymous
Nanometer is 10^-9, the answer you got was 10^-7, so just some need to do conversion and you get the numbers.
arindameducationusc
  • arindameducationusc
now listen carefully 1nm=10^-9m, right? so,when we have 4.87*10^-7 if we take it to nanometer, 100 is multiplied to 4.87
arindameducationusc
  • arindameducationusc
and 100 is divided in 10th power to make it to nanometer.....
arindameducationusc
  • arindameducationusc
so, you get 487*10^-9, Got it?
anonymous
  • anonymous
is their a single number i can just times by
arindameducationusc
  • arindameducationusc
I didn't get you, single number?
anonymous
  • anonymous
yea like when we have somthing in grams we just divide by 1000 to get in kg
anonymous
  • anonymous
0.000000001
arindameducationusc
  • arindameducationusc
yes, yes
arindameducationusc
  • arindameducationusc
10^-9 is 0.000000001 10^-7 is 0.0000001
anonymous
  • anonymous
in my data shhet i have to h values one in ev and the other in J which one to use?
arindameducationusc
  • arindameducationusc
eV
anonymous
  • anonymous
how know for sho
arindameducationusc
  • arindameducationusc
1eV=1.602*10^-19 J
arindameducationusc
  • arindameducationusc
you can convert and write anyone.... its your choice....
anonymous
  • anonymous
if the question is in ev then i use ev right
arindameducationusc
  • arindameducationusc
yes.. ofcourse
arindameducationusc
  • arindameducationusc
But you can use Joules, but it will just become complicated...
arindameducationusc
  • arindameducationusc
Got it?
anonymous
  • anonymous
yea
anonymous
  • anonymous
i hav e anotehr
anonymous
  • anonymous
i was doing these practive probs but wasnt getting the right answer doww
anonymous
  • anonymous
frequineces required for photoelectron emsiion in 400 THz
arindameducationusc
  • arindameducationusc
ya, i will try ask
anonymous
  • anonymous
wavelength 500nm what is speed if excaping eletrons ?
anonymous
  • anonymous
tell me waht u get for speed
arindameducationusc
  • arindameducationusc
from which orbit are the electrons escaping?
anonymous
  • anonymous
doesnt say anthing else
anonymous
  • anonymous
their was a work funstion 2.65*10^-19
arindameducationusc
  • arindameducationusc
ya work function....
arindameducationusc
  • arindameducationusc
Wait
arindameducationusc
  • arindameducationusc
The minimum energy required to make an electron free from the metal is called the work function, right?
anonymous
  • anonymous
ye
arindameducationusc
  • arindameducationusc
okay I got it....... use this
arindameducationusc
  • arindameducationusc
hc/lambda=workfunction+K.E
arindameducationusc
  • arindameducationusc
K.E is kinetic energy
arindameducationusc
  • arindameducationusc
and K.E=1/2mv^2
arindameducationusc
  • arindameducationusc
so you can get v from here.... rest all data given h,c,lambda,mass of electron and work function
arindameducationusc
  • arindameducationusc
just plug in the values... you will get the answer. Got it?
anonymous
  • anonymous
Ek=hc/wavelenght
anonymous
  • anonymous
i tried i didnt get btw what u get
arindameducationusc
  • arindameducationusc
so, do you have the answer with you? I will solve and ask you
anonymous
  • anonymous
yes
arindameducationusc
  • arindameducationusc
9.33 * 10^21
arindameducationusc
  • arindameducationusc
long calculation
anonymous
  • anonymous
its 5.40*10^5
arindameducationusc
  • arindameducationusc
hmmm
arindameducationusc
  • arindameducationusc
but the process is this way.... well I was of no use... sorry... I did my best....

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