Understanding Plank's Constant and Its Application in Energy Calculations

[HoboRobo]

What am I doing wrong in this problem? Please explain to me what I am doing wrong. Thanks
h-bar is plank's constant.

E = (l(l+1)(h-bar^2))/2I (l = 1)

I = Mh*R^2 Mh = 1.67x10^(-24)g R = 161x10^(-10) cm

For I i got 4.33x10^-40

So when i plugged in I for the top equation, i got E = (1(1+1)(1.11x10^(-68)))/8.66x10^-40
which equaled to : 2.56351... x 10^-29
But I found out from a friend that E actually equals to -2.18x10^(-18) Joules

What am I doing wrong?

 

[vela]

It would help if you told us what the actual problem is. All I see is you plugging random numbers into random equations.

Edit: Okay, it makes more sense with a bit of formatting.

h-bar is plank's constant.

E = (l(l+1)(h-bar^2))/2I (l = 1)

I = Mh*R^2
Mh = 1.67x10^(-24)g
R = 161x10^(-10) cm

For I i got 4.33x10^-40

So when i plugged in I for the top equation, i got E = (1(1+1)(1.11x10^(-68)))/8.66x10^-40
which equaled to : 2.56351... x 10^-29
But I found out from a friend that E actually equals to -2.18x10^(-18) Joules

What am I doing wrong?

You need to keep track of your units. You're not using SI units everywhere, so your answer isn't going to come out in Joules.