What is Destructive interference: Definition and 126 Discussions
In physics, interference is a phenomenon in which two waves superpose to form a resultant wave of greater, lower, or the same amplitude. Constructive and destructive interference result from the interaction of waves that are correlated or coherent with each other, either because they come from the same source or because they have the same or nearly the same frequency. Interference effects can be observed with all types of waves, for example, light, radio, acoustic, surface water waves, gravity waves, or matter waves. The resulting images or graphs are called interferograms.
Homework Statement
Two identical loudspeakers are located at points A and B, 2.00 m apart. The loudspeakers are driven by the same amplifier and produce sound waves with a frequency of 784 Hz. Take the speed of sound in air to be 344 m/s . A small microphone is moved out from point B along a...
Homework Statement
Two speakers are driven by the same oscillator whose frequency is 140 Hz. They are located on a vertical pole a distance of 4.45 m apart from each other. A man walks straight toward the lower speaker in a direction perpendicular to the pole.
(a) How many times will he hear...
Homework Statement
A sheet of mica sits on glass (n = 1.8). How thick should the sheet of mica (n = 1.5) be if it is to be as thin as possible and still give rise to destructive interference for reflection of light in the blue part of the spectrum (use l = 420 nm)? (All parts of the mica...
The problem states:
Waves broadcast by a 1152 kHz radio sta-
tion arrive at a home receiver by two paths.
One is a direct path, and the second is from
re°ection o® an airplane directly above the re-
ceiver. The airplane is approximately 137 m
above the receiver, and the direct distance...
The problem:
Two speakers emit a sound with a frequency of 550.0Hz. At what distance should they be placed to maximize destructive interference?
I have the steps in solving this problem written on my worksheet, and it says that the speakers should be placed at 1/2 wavelength. The thing I...
Homework Statement
A pebble is dropped in a lake; and it produces ripples with a frequency of .25 Hz. When should a second pebble be dropped at the same place to produce destructive interference
Homework Equations
I'm not even sure if these apply, but they are the only formulas I know...
Homework Statement
Two loudspeakers are located 3.42m apart on an outdoor stage. A listener is 18.80m from one and 19.60m from the other. During the sound check, a signal generator drives the two speakers in phase with the same amplitude and frequency. The transmitted frequency is swept...
Homework Statement
Speaker A and B are separated by 5.00m. A listener, C, stands a distance directly in front of speaker B. What is the largest possible distance between speaker B and the listener so that he observes destructive interference? The two speakers vibrate in phase and play...
Hi!
I hope I'm posting in the right place!
In the destructive interference of waves and solving for the path difference, I"m confused at when we should use m+1/2 vs. m-1/2 ( so the eq'n is PD=(m+1/2)lambda or PD=(m-1/2) lambda
Any insight would be greatly appreciated! :)
thanks!
I am looking for the distance between the 2nd and 3rd DARK fringes on a screen.
Monochromatic, coherent light is shone through 2 slits a distance d apart.
Wavelength is L. Distance between grating and screen is R.
The formula I am using is: [(R(5/2)L)/d - (R(3/2)L)/d]
I am using 5/2...
Homework Statement
Homework Equations
destructive interference occurs at 0.5(lambda), (3/2)(lambda),...
The Attempt at a Solution
I found the path difference to be:
d=sqrt(4+x^2)-x
and this has to be equal to (n)(lambda)/2 where n is an odd integer for destructive...
Hi All,
I have a question about the practicability of this theory; now I'm no physicist, so please bear with me.
A company sells a chip which is said to "harmonize" the effects of the harmful radiation from a cellular phone.*
*I hope a debate won't ensue :devil:.
Now, the chip is...
1. A nonreflective coating (n = 1.24) covers the glass (n = 1.52) of a camera lens. Assuming that the coating prevents reflection of yellow-green light (wavelength in vacuum = 564 nm), determine the minimum nonzero thickness that the coating can have.
2. wavelength of the light in the...
The drawing shows a loudspeaker A and point C, where a listeer is positioned. A second loudspeaker B is located somewhere to the right of A. Both speakers vibrate in phase and are playing a 68.6-Hz tone. The speed of sound is 343 m/s. What is the closest to speaker A that speaker B can be...
Two oblong pieces of plane glass are separated from each other by a thin sheet of cellophane and held together with rubber bands, as shown in figure(I provided a website for the figure below), where the amount of separation is much exaggerated. If you place a "sodium vapor lam" vertically above...
Hello. I'm having some trouble on the last of my homework problems for this week. The problem has to do with destructive interference and is as follows:
Suppose that the separation between speakers A and B is 6.00 m and the speakers are vibrating in phase. They are playing identical 130 Hz...
Here is the question
An upright square pulse and an inverted triangular pulse were directed toward each other on a spring, as shown in the illustration. Sketch the appearance of the spring at the instant the two pulses met and completely overlapped. What principle did you use in...
A sound wave with intensity 25 mW/m^2 interferes destructively with a sound wave with intensity 28 mW/m^2. What is the intensity of the superposition of the two?
I've read through this section in my textbook three times now and I still have no clue as to how to go about figuring this out...
Destructive Interference: Please Help!
Two loudspeakers are 2.36m apart. A person stands 2.8m from one speaker and 3.4m from the other. What is the lowest frequency at which destructive interference will occur at this point?
My answer is wrong, but this is what I did:
3.4m-2.8m=0.6m, so...
I moved this from a different thread as i thought it would be more appropriate here.
If two photons were to arrive at a single spot by accident such that they were half a lambda out of phase they would destructively interfere. Where would the energy go?
Let us arrange a coherent monochromatic light beam, e.g. a laser beam, to
be split and directed along two paths. With repect to the light's
wavelength, the paths are suitably arranged such that a half-cycle net
time delay exists between them. These beams are then recombined
downstream, so...
There is a diagram in my book for this problem... I'll try my best to describe it! There are two speakers (A & B) that form a right triangle (at B) with the listener (C). Suppose that the separation between speakers A and B is 5.00 m and the speakers are vibrating in phase. They are playing...
Good day
I have tried the following problem a few times and come up with ansers larger than 3.20m.
The problem: Two speakers are 3.20m apart and facing the same direction and are in phase. They each produce a 214Hz tone. What is the shortest distance directly in front of one speaker where...
Good day - I would appreciate some direction. I have done the problem a few different ways and end up with different answers each time - which seems to be reasonable answers to all.
Two speakers are 3.2 m apart and facing the same directions are in phase. They each produce 214 Hz tone. What...
I searched for a topic already about this and i couldn't really see one so here we go.
A teacher of mine showed this problem to me and could not see a solution just as i cannot either.
A single laser beam is sent on a path as in the diagram enclosed as an attachment.
If you look in the...
Here is the problem:
The waves froma radio station can reach a home reciever by two paths. One is a straightline path from transmitter to home, a distance of 19900 m. THe second path is by reflection from the ionoshpere.
Assume: this reflection takes place at a point midway...