iamaelephant
Diamond Member
Hope someone can help me out here, I'm very new to this wave interference thing.
The question:
2 point sources of a wave are 1.0mm apart. At a distance of 1.0m away, the distance between the third nodal lines either side of the central antinodal line is 3.2mm.
Calculate the wavelength of the wave.
What I'm doing:
(n - 1/2) (wavelength) = (dx)/L
(wavelength) = (dx)/L(n - 1/2)
(wavelength) = (10^-3 * 3.2 * 10^-3)/2.5
=1.3*10^-6
The answer I should be getting is 6.4*10^-7
Am I using the right formula here?
d = 10^-3m (1mm, distance between the two point sources)
x = 3.2*10^-3 (3.2mm, distance of the third nodal line from the central antinodal line)
(n - 1/2)(wavelength) is the formula for path distance
I would very much appreciate if someone could tell me where I'm going wrong. FYI, I only started learning interference patterns today. I teach myself through a text book and only see a tutor once a week and it's not for a few more days, I would like to get through this as quickly as possible before then. Thanks!
The question:
2 point sources of a wave are 1.0mm apart. At a distance of 1.0m away, the distance between the third nodal lines either side of the central antinodal line is 3.2mm.
Calculate the wavelength of the wave.
What I'm doing:
(n - 1/2) (wavelength) = (dx)/L
(wavelength) = (dx)/L(n - 1/2)
(wavelength) = (10^-3 * 3.2 * 10^-3)/2.5
=1.3*10^-6
The answer I should be getting is 6.4*10^-7
Am I using the right formula here?
d = 10^-3m (1mm, distance between the two point sources)
x = 3.2*10^-3 (3.2mm, distance of the third nodal line from the central antinodal line)
(n - 1/2)(wavelength) is the formula for path distance
I would very much appreciate if someone could tell me where I'm going wrong. FYI, I only started learning interference patterns today. I teach myself through a text book and only see a tutor once a week and it's not for a few more days, I would like to get through this as quickly as possible before then. Thanks!
