Destructive interference is when two pulses meet, resulting in a smaller pulse.
The two pulses shown below approach each other at
$1\phantom{\rule{2pt}{0ex}}\mathrm{m}\xb7\mathrm{s}{}^{-1}$ . Draw what the waveform would look like after
$1\phantom{\rule{2pt}{0ex}}\mathrm{s}$ ,
$2\phantom{\rule{2pt}{0ex}}\mathrm{s}$ and
$5\phantom{\rule{2pt}{0ex}}\mathrm{s}$ .
After
$1\phantom{\rule{2pt}{0ex}}\mathrm{s}$ , pulse A has moved
$1\phantom{\rule{2pt}{0ex}}\mathrm{m}$ to the right and pulse B has moved
$1\phantom{\rule{2pt}{0ex}}\mathrm{m}$ to the left.
After
$1\phantom{\rule{2pt}{0ex}}\mathrm{s}$ more, pulse A has moved
$1\phantom{\rule{2pt}{0ex}}\mathrm{m}$ to the right and pulse B has moved
$1\phantom{\rule{2pt}{0ex}}\mathrm{m}$ to the left.
After
$5\phantom{\rule{2pt}{0ex}}\mathrm{s}$ , pulse A has moved
$5\phantom{\rule{2pt}{0ex}}\mathrm{m}$ to the right and pulse B has moved
$5\phantom{\rule{2pt}{0ex}}\mathrm{m}$ to the left.
The idea of superposition is one that occurs often in physics. You will see
much, much more of superposition!
Experiment: constructive and destructive interference
Aim
To demonstrate constructive and destructive interference
Apparatus
Ripple tank apparatus
Method
Set up the ripple tank
Produce a single pulse and observe what happens
Produce two pulses simultaneously and observe what happens
Produce two pulses at slightly different times and observe what happens
Results and conclusion
You should observe that when you produce two pulses simultaneously you see them interfere constructively and when you produce two pulses at slightly different times you see them interfere destructively.
Problems involving superposition of pulses
For the following pulse, draw the resulting wave forms after
$1\phantom{\rule{2pt}{0ex}}\mathrm{s}$ ,
$2\phantom{\rule{2pt}{0ex}}\mathrm{s}$ ,
$3\phantom{\rule{2pt}{0ex}}\mathrm{s}$ ,
$4\phantom{\rule{2pt}{0ex}}\mathrm{s}$ and
$5\phantom{\rule{2pt}{0ex}}\mathrm{s}$ . Each pulse is travelling at
$1\phantom{\rule{2pt}{0ex}}\mathrm{m}\xb7\mathrm{s}{}^{-1}$ . Each block represents
$1\phantom{\rule{2pt}{0ex}}\mathrm{m}$ . The pulses are shown as thick black lines and the undisplaced medium as dashed lines.
For the following pulse, draw the resulting wave forms after
$1\phantom{\rule{2pt}{0ex}}\mathrm{s}$ ,
$2\phantom{\rule{2pt}{0ex}}\mathrm{s}$ ,
$3\phantom{\rule{2pt}{0ex}}\mathrm{s}$ ,
$4\phantom{\rule{2pt}{0ex}}\mathrm{s}$ and
$5\phantom{\rule{2pt}{0ex}}\mathrm{s}$ . Each pulse is travelling at
$1\phantom{\rule{2pt}{0ex}}\mathrm{m}\xb7\mathrm{s}{}^{-1}$ . Each block represents
$1\phantom{\rule{2pt}{0ex}}\mathrm{m}$ . The pulses are shown as thick black lines and the undisplaced medium as dashed lines.
For the following pulse, draw the resulting wave forms after
$1\phantom{\rule{2pt}{0ex}}\mathrm{s}$ ,
$2\phantom{\rule{2pt}{0ex}}\mathrm{s}$ ,
$3\phantom{\rule{2pt}{0ex}}\mathrm{s}$ ,
$4\phantom{\rule{2pt}{0ex}}\mathrm{s}$ and
$5\phantom{\rule{2pt}{0ex}}\mathrm{s}$ . Each pulse is travelling at
$1\phantom{\rule{2pt}{0ex}}\mathrm{m}\xb7\mathrm{s}{}^{-1}$ . Each block represents
$1\phantom{\rule{2pt}{0ex}}\mathrm{m}$ . The pulses are shown as thick black lines and the undisplaced medium as dashed lines.
For the following pulse, draw the resulting wave forms after
$1\phantom{\rule{2pt}{0ex}}\mathrm{s}$ ,
$2\phantom{\rule{2pt}{0ex}}\mathrm{s}$ ,
$3\phantom{\rule{2pt}{0ex}}\mathrm{s}$ ,
$4\phantom{\rule{2pt}{0ex}}\mathrm{s}$ and
$5\phantom{\rule{2pt}{0ex}}\mathrm{s}$ . Each pulse is travelling at
$1\phantom{\rule{2pt}{0ex}}\mathrm{m}\xb7\mathrm{s}{}^{-1}$ . Each block represents
$1\phantom{\rule{2pt}{0ex}}\mathrm{m}$ . The pulses are shown as thick black lines and the undisplaced medium as dashed lines.
For the following pulse, draw the resulting wave forms after
$1\phantom{\rule{2pt}{0ex}}\mathrm{s}$ ,
$2\phantom{\rule{2pt}{0ex}}\mathrm{s}$ ,
$3\phantom{\rule{2pt}{0ex}}\mathrm{s}$ ,
$4\phantom{\rule{2pt}{0ex}}\mathrm{s}$ and
$5\phantom{\rule{2pt}{0ex}}\mathrm{s}$ . Each pulse is travelling at
$1\phantom{\rule{2pt}{0ex}}\mathrm{m}\xb7\mathrm{s}{}^{-1}$ . Each block represents
$1\phantom{\rule{2pt}{0ex}}\mathrm{m}$ . The pulses are shown as thick black lines and the undisplaced medium as dashed lines.
For the following pulse, draw the resulting wave forms after
$1\phantom{\rule{2pt}{0ex}}\mathrm{s}$ ,
$2\phantom{\rule{2pt}{0ex}}\mathrm{s}$ ,
$3\phantom{\rule{2pt}{0ex}}\mathrm{s}$ ,
$4\phantom{\rule{2pt}{0ex}}\mathrm{s}$ and
$5\phantom{\rule{2pt}{0ex}}\mathrm{s}$ . Each pulse is travelling at
$1\phantom{\rule{2pt}{0ex}}\mathrm{m}\xb7\mathrm{s}{}^{-1}$ . Each block represents
$1\phantom{\rule{2pt}{0ex}}\mathrm{m}$ . The pulses are shown as thick black lines and the undisplaced medium as dashed lines.
What is superposition of waves?
What is constructive interference?
What is destructive interference?
Questions & Answers
anyone know any internet site where one can find nanotechnology papers?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?