Recent content by phys62

1. Completing nuclear reactions

Homework Statement Complete the following nuclear reactions, assuming that the unknown quantity signified by a question mark is a single entry. Use the following table for your answers: 0 = gamma, 1 = p, 2 = alpha , 3 = n. (a) 20X43(alpha,?)21X46 (b) 4X9(?,n)6X12 Homework Equations...
2. Finding the binding energy for lithium

Oops, sorry I know I typed the formula wrong on here, but I did it the correct way on my homework... It's still telling me my answer is incorrect. :/
3. Finding the binding energy for lithium

Homework Statement Find the binding energy (in MeV) for lithium 3Li8 (atomic mass = 8.022486 u). Homework Equations Binding energy = (#p)(mass proton) + (#n)(mass neutron) - (mass nuclei*c^2) The Attempt at a Solution mass proton = 1.007825 mass neutron = 1.008665 Binding energy...
4. Determining the number of photons that reach the earth

Oh wow, I never knew I could write my answers that way on this program. haha thanks!
5. Determining the number of photons that reach the earth

The program I enter my homework answers into doesn't let me have that many decimal places in my answer though (we have to write it out long, it doesnt let us put x10^21), so I was assuming I must've done something wrong.. :-/
6. Determining the number of photons that reach the earth

Homework Statement Light is shining perpendicularly on the surface of the earth with an intensity of 910 W/m2. Assuming all the photons in the light have the same wavelength (in vacuum) of 668 nm, determine the number of photons per second per square meter that reach the earth. Homework...
7. What angle is subtended when using this 270-diopter objective?

Ohh, I was making it harder than it should be. Thank you very much!
8. At what angle does the light leave the glass

Homework Statement The drawing shows a rectangular block of glass (n = 1.52) surrounded by a liquid with n = 1.79. A ray of light is incident on the glass at point A with a 30.0° angle of incidence. At what angle does the ray leave the glass at point B...
9. What angle is subtended when using this 270-diopter objective?

I don't really understand what this means.. how are you saying I would go about solving this with that in mind?
10. What angle is subtended when using this 270-diopter objective?

Homework Statement An anatomist is viewing heart muscle cells with a microscope that has two selectable objectives with refracting powers of 140 and 270 diopters. When she uses the 140-diopter objective, the image of a cell subtends an angle of 3.7 x 10-3 rad with the eye. What angle is...
11. Determine image distance relative to lens

It's telling me that answer is incorrect.. I guess I'll try the -12.547 next
12. Determine image distance relative to lens

Ok so I took 1/13.487 + 1/i = 1/-6.5 and I solved for i and got -4.386 cm. Is this correct, or should I have used -13.487 and got -12.547 as my answer?
13. Determine image distance relative to lens

Homework Statement Two identical diverging lenses are separated by 13 cm. The focal length of each lens is -6.5 cm. An object is located 3.0 cm to the left of the lens that is on the left. Determine the final image distance relative to the lens on the right. Homework Equations 1/i + 1/o...
14. At what angle does the light leave the glass?

Nevermind, I got it :] 53.13 degrees is the answer. Thanks!
15. At what angle does the light leave the glass?

Ohh, is this right then..? sintheta2 = (1.6) sin30/1 theta2 = 53.13