Tagged Questions
2
votes
1answer
194 views
Covariant derivative
I would very much appreciate some help in The following:
What is 2nd order covariant derivative $$\nabla_i\nabla_jf(r)$$ in terms of $r,\theta, g(r)$ and partial derivative, given that the metric ...
0
votes
1answer
110 views
Space between slits of diffraction grating? [closed]
White light enters a diffraction grating placed in front of a very wide viewing screen. Only the central white spot and the first order spectrum are visible on the screen.
How many lines per ...
0
votes
3answers
99 views
How do I determine where I can no longer hear sound?
A teacher stands well back from an outside doorway that is 95 cm wide and blows a frequency of 600 Hz. The door faces north. Assume the speed of sound is 340 m/s and that there are no reflections. At ...
0
votes
0answers
47 views
Resolving power [closed]
In strong light, the pupil of a cat narrows to a vertical slit about 0.5mm across. Can a cat resolve two white mice sitting 5 cm apart a distance of 20m away under these conditions?
And why?
Its to ...
0
votes
1answer
345 views
Diffraction through a single slit?
I'm having some trouble finding the answer to this homework question:
A wide beam of light from a laser with a wavelength of 450.0 nm is
incident on a long narrow opening that is 0.300 mm wide. ...
2
votes
1answer
375 views
Application of diffraction problem!
Here is a problem that I am working on, which is the applying the concepts of diffraction to the setting of the sun:
Air has a small, usually negligible index of refraction. It is 1.0002926. This ...
