Recent content by kevnm67

The angle of refraction is half the angle of incidence, so θ refraction is .5 θ incidence.

Ha, no exactly sure where to start without angles. My thought is since the angle of refraction is half that of the incident angle and your working within 90 degrees, 45 degrees is the only possibility?

Ok, so I do know Snells law and was thinking it should be 45...but is this the only angle it could be?

Homework Statement A light ray in air is incident on a glass plate whose index of refraction is 1.42. The angle of refraction (transmitted angle) is one-half the angle of reflection. (Take the index of refraction in air to = 1.00). A) Relative to the normal to the plate’s surface, what...

Ok. I got it all now...radians! Thanks again, Dr. Al, ill be sure to give you credit on my final tomorrow ;)

Yep, it's copied correctly... for a I did: theta = p (lamda/a) and I get 10.25, not the other no., I used the wrong angle.

Homework Statement A single slit forms a diffraction pattern, with the first minimum at an angle of 40 from the central maximum. Monochromatic light of 410 nm wavelength is used. The same slit, illuminated by a different monochromatic light source, produces a diffraction pattern with the...

Thanks for your help!

Doc Al, I want to run this by you if you get this post... A 3600 line/cm diffraction grating produces a third-order bright fringe at a 31.0 degree angle. (Recall: 1 cm = 10-2 m; 1 mm = 10-3 m; 1 nm =10-9 m) A) What wavelength (in nm) of light is being used? a. 477 nm b. 1430 nm c. 233...

When I do that I get: 3.9eV x (1.6 x 10-19 6.24 x 10-19 Then multiplying that no. by 5x10-3 doesn't give me the correct answer. What am I doing wrong?

Homework Statement A photocathode whose work function is 2.9 eV is illuminated with white light that has a continuous wavelength band from 400 nm to 700 nm. A) What is the threshold frequency for photoelectron production? a. 4 x 1014 Hz b. 7 x 1014 Hz c. 13 x 1014 Hz B) What is the...

Homework Statement Summer has arrived and you decide to go to the tanning bed. After arriving, you recall from physics class that the threshold for tissue damage from ultraviolet light corresponds to a wavelength of 300nm. You decide to inquire about the limits of exposure. You're informed...

Your correct, both numbers are positive, but I only solved A. How do you solve B?

Homework Statement The picture of a tree on a 35 mm color slide is 1.7 mm high. It is to be projected onto a screen 8.0 m from the slide, and is to appear 559 mm high. a) What focal length lens (in meters) is needed? b) What is the distance in meters between the lens and the slide? c)...

great, thanks Doc Al!