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RAGGING-CAN BE GIVEN A MORE POSITIVE DIRECTION
posted on 02 May 2009
by:anshu chaudhry
PARENTS MUST HAVE REALISTIC EXPECTIONS
posted on 02 May 2009
by:anshu chaudhry
SOCIALISATION -THE FOUNDATION 0F HUMAN LIFE
posted on 29 Apr 2009
by:lalit kumar
CBSE Multimedia Animated CD DVD : Free Delivery Dial 01164614067
posted on 28 Mar 2009
by:TopRank India
JUST PASS IT ON..........
posted on 24 Mar 2009
by:anshu chaudhry
SHARING-THE BEST WAY TO GO!
posted on 24 Mar 2009
by:anshu chaudhry
OBESITY ON THE RISE IN CHILDREN
posted on 24 Mar 2009
by:anshu chaudhry
INSTILL HEALTHY EATING HABITS IN YOUR CHILDREN
posted on 24 Mar 2009
by:anshu chaudhry
Schoolsonweb
posted on 20 Feb 2009
by:Poo
DEALING WITH MOOD SWINGS!!!:-(
posted on 15 Feb 2009
by:priyannkaa dey
 
Featured Experiments
1 Combustion reactions
Combustion reactions of hydrocarbons with excess oxygen
2 Effusion Macromolecular
3 NO2 N2O4 equilibrium
4 Amount of moles and atoms in metals
5 Method of Initial Rates at the molecular level
6 pH Measurements: Salts & Buffers
7 Atomic Spectra of Hydrogen and red shift
This applet shows you atomic spectra of hydrogen.



The wavelengths of hydrogen spectra lines can be described by the following equation:



1/λ=RH*(1/n12-1/n22)

where RH=1.0973732*107 m-1



You can change n1 with the slider bar. The program will plot a series of spectrum lines.

You might want to change the xmax(at the right) to see the full range of the spectra.

One of the line is thicker and with an arrow is the one with n2 equal to slider bar value.



Click within simulation region will toggle "visible spectra range".



You can also find out how the red shift of the spectra calculated from Hubble's law.

v=H0 D where the recessional velocity is proportional to the distance of the star to the earth (D). You can adjust the distance of the star.

And see the red shift of the hydrogen spectra from that star due to the expansion of the universe.





n1=1 NULL series (Ultraviolet)

n1=2 NULL series (Near Ultraviolet and Visible)

n1=3 NULL series (Infrared)

n1=4 NULL series (Infrared)

n1=5 NULL series (Infrared)
8 Law of reflection
The law of reflection tell us:
The angle of incidence equals the angle of reflection.
If you change the orientation of the mirror by angle X,
 the angle of incident and the angle of reflection will both change X.
So, the angle of the reflected ray changes by 2X.
You can drag the light source(with mouse) to change the incident angle,too.
9 Wave bounced from the boundary and the interference pattern
Watch interference of two wave and how waves were bounced from the boundary.
10 Traffic Control System
Would you like to engineer the traffic light system for a one-way street that consists of several lanes along which rush-hour traffic flows?

How would you time the onset of green lights at the various intersection?
How to promote the traffic flow? This experiment lets you play with it.

You can click the +/- sign to change the time delay between traffic lights.

How to use this experiment

  1. The traffic lights at interactions are for cars moving from left to right. The traffic on the perpendicular streets can only move when light is RED.

  2. You can change the period of each light

    1. Clicking the traffic light at the top-left corner
    2. The number near each color is the period for that particular light (second)
    3. Left/Right mouse click will decrease/increase one second
    4. ( for MAC user, click between light and number to the right to increase the length of time)

  3. Parameter controls: Each click to the arrow at left/right of the number will decrease/increase
    the parameter by 1 unit.

    1. Delay time control: near the traffic light controls the delay of the onset of green light at the interaction relative to that at previous intersection.
    2. Max Velocity control: represents the speed limit  ¡]Vmin=5, Vmax= 50¡^
    3. Acceleration control: represents the acceleration for the car when it speeds up. ¡]Amin=1 , Amax=20¡^

  4. Text Field values

    1. T¡G time in second after pressing the start button
    2. N1/N2/flow rate¡G total number of cars passes intersection (N1:left-right/N2:up-down)
      flow rate=(N1+N2/3.)/T
    3. n1/n2/flow rate¡G number of cars passes intersection during last minute.
      flow rate=(n1+n2/3.)/60


  5. Color code for car
    1. yellow: accelerating (A>0.)
    2. green: moving with constant speed (include stopped) A=0.
    3. red: stopping (A<0.)


  6. Velocity of each car is represented by a blue dot.

  7. A new function has been added to help you determine the delay time between traffic lights.
    Click the right mouse button to suspend (the animation).
    The time intervals (for the first car ) during which the signals are green/yellow/red
      are represented by thin (colored)lines at one side of the road.

  8. A blue curve represent x-t (displacement verse time) for the first car is shown.
    Use that curve with those color intervals to adjust the delay time between
    traffic lights. Click the right mouse button again to resume.

Observation:

  1. Suppose a platoon is stopped at interaction. When the green light comes on, there is a "start-up wave" travels from the leader along the length of the platoon at a speed vs.
  2. How to adjust parameters to increase the traffic flow?
    1. adjust timing of each light
    2. adjust delay time control
    3. adjust Vmax
    4. adjust A(acceleration)

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