Recent content by y_chen

A double-slit experiment is set up using a helium-neon laser (lambda =633nm) . Then a very thin piece of glass ( n=1.50 ) is placed over one of the slits. Afterward, the central point on the screen is occupied by what had been the m = 15.0 dark fringe. How thick is the glass? I really need...

I assumed that this system is an open-open system. Is that right? If it is accurate, then wouldn't m represent the number of nodes? Would the second length represent the second harmonic then? Wouldn't changing the length change the fundamental frequency? How do you know that the shortest...

I still don't really understand how the value of m connects to the three values of L. And how can that help me to find the frequency of the tuning fork? << spam links deleted by berkeman >>

Homework Statement A 40-cm-long tube has a 40-cm-long insert that can be pulled in and out. A vibrating tuning fork is held next to the tube. As the insert is slowly pulled out, the sound from the tuning fork creates standing waves in the tube when the total length L is 42.5 cm, 56.7 cm, and...

Homework Statement An AM radio station broadcasts with a power of 21.0 kW at a frequency of 910 kHz. Estimate the intensity of the radio wave at a point 18.0 km from the broadcast antenna. Homework Equations I= p/A I1/I2=r2^2/r1^2 w=2pi f The Attempt at a Solution From the...