Is Resonance a wave mystique??

In one of my lecture, a student asked me..is it true a soprano singer can really break a wine glass?? I said Yes!..kenapa?? tak percaya?? He asked again.. How come?? I said..its due to the effect of resonance.
How???..to answer this then u must watch this video first...

(Please don't try this without a goggle..who knows u might have the voice)

So.. what is actually resonance ??
Resonance happens when a system is forced to vibrate/oscillate at a frequency that equal to its natural frequency by an external force

Lets figure out what does it mean by an external force..Watch the following video!

(the recorded sound acts as an external force which force the glass to vibrate at its natural frequency)

Lets now examine the Barton pendulum case..try to watch next video!

• the weight caused the horizontal support to vibrate at the natural frequency of a pendulum system of its length
• resonance causing the other pendulum of similar length to oscillate the most

Have a look at this one as well..resonance can sometimes create disaster..

The bridge has a natural frequency, and the wind (an external force) forces the bridge to osicllate at its natural frequency. This is called resonance. The amplitude increases and the system (the bridge) reaches its maximum energy.

Getting to know WAVE..

Hi , ive just came back from teaching last nite. I did explain about refraction & diffraction of wave, & the students look a bit blur ..so i gave a 2nd thots & concluded that b4 i go detail about refraction, my student must b able to appreciate these terms; (tak kenal maka tak cinta :)
After reading all these, u guys should check tis out!! Its fun




Amplitude?
As waves travel, they set up patterns of disturbance. The amplitude of a wave is its maximum disturbance from its undisturbed position. Just look at figure above!

Wavelength?
It is the distance between a point on one wave and the same point on the next wave. Usually we take the distance between crest(puncak) to another crest.

Frequency, f?
The frequency of a wave is the number of waves produced by a source each second. It comes from a word 'frequent'(berapa kali), it also means how frequent the wave produced per second.
By formula, f= 1 /T and its unit is Hz.
For example,Your PC might be working with a frequency of 4GigaHertz i.e 4000000000000 numbers of data received per second.

Period, T?
It is the time taken for 1 complete vibration or oscillation of a wave. In formula, T= 1/ f

Speed of wave,v?
the speed of wave represented by a formula, v=f λ i.e the product of frequency and its wavelength.

Longitudinal Wave

The another type of wave is LONGITUDINAL WAVE. So,how to define this wave?


A longitudinal wave is a wave in which particles of the medium move in a direction parallel to the direction which the wave moves.

As u see in the figure above, it can b represented by motion of springs forward & backward i.e the particles move parallel with the direction of the wave. The result of such longitudinal vibrations is the creation of compressions and rarefactions. Compression is the part of the spring motion which is 'rapat2'. Kalau nak faham better, Cuba try to watch this..

Video : Longitudinal Wave

Now, can u compare the different between transverse & longitudinal wave??
Then check this video.. u'll see the different.

Transverse Wave

Some students found WAVE topic is quite hard..well, it might b susah, but trust me its an interesting topic. Firtstly u need to understand what is wave..Wave can be produced either through oscillation or vibration. Like Tsunami, the massive wave produced by vibration of the surface of the earth(earthquake). They claimed the amplitude of the wave might had reached 20 feet..about 5 times of my height :)

Besides that, U must also appreciate that waves is a transfer of energy without transfer of matter.

Wave has two type :

1. Transverse wave
2. Longitudinal wave
   

So what is transverse waves?

A transverse wave is a wave in which particles of the medium move in a direction perpendicular to the direction which the wave moves.

Hmmm..still tak faham?
Ok.. to understand it better, just imagine buah kelapa yang hanyut dibawa ombak. This buah kelapa can represents motion of the particles. Buah kelapa turun & naik .i.e this motion is similar as moving perpendicular to the direction of the wave. (Pependicular = at right angles)

If u stil dont get it, look at this animation.

U can see the motion of the particles moving up & down..pependicularly

Video: Transverse wave

Light, Electromagnetic, & Water waves are examples of transverse wave