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April 28, 2015

Homework Help: physics

Posted by april on Wednesday, May 30, 2012 at 7:24pm.

(1) If an electromagnetic wave has a period of 4.8 μs, what is the frequency and wavelength?

I know how to find the frequency but for the wavelength how can we find it without the velocity being given????

(2) The beam of a helium-neon laser (λ = 632.8 nm) is incident on a slit of width 0.085 mm. A screen is placed 95.0 cm away from the slit. How far from the central band is the first dark band? If the slit was two times wider, would the first dark band be closer or farther form the central band?

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