INSTRUCTION MANUAL FOR RIPPLE TANK

Phones : +91-171-2699347,2699267

Fax : +91-171-2699102,2699222Website: www.indosawedu.com

New Delhi, Phone : 011-46525029E-mail : eenquiry@indosaw.com (Foreign Customer)

E-mail : denquiry@indosaw.com (Indian Customer)

NABCBQMO11

T

South Asia

SUD

UV

NOTE:Power supply and Hand stroboscope additionally required.

INTRODUCTION:

The wave tank is an apparatus to demonstrate & study of waves phenomenon & their properties on

the surface of the water. There is a provision to generate pulses as well as periodic waves either of

the two being also available as circular as well as plane waves. Varieties of experiments are

demonstrated with this apparatus & its accessories.

It consists of following item:

1. Water tank with detachable 4 legs

2. Stroboscope (A stroboscope makes it easier to see patterns of wave behaviour with

continuous ripples in a ripple tank, especially with ripples at higher frequencies).

3. Power supply for Bulb and Small motor (Motor used for making waves in the water)

4. Movable Light source 12V LAMP with holder

5. Up and down vibrating ripple holder supporting 6V motor.

RIPPLE TANK WITH POWER SUPPLY AND STROBOSCOPE

Accessories:-

S.No. Item Name Qty.

1 ILLUMINANT FOR RIPPLE TANK 12 TRAY BASE 13 BOSS HEAD 14 STAND ROD 15 LEVELING WEDGES 26 LEAD WITH BANANA PLUG 17 REFRACTION PLATE 18 BARRIERS SPHERICAL 19 BARRIERS BIG 210 BARRIERS SMALL 111 STRAIGHT DIPPER 112 LEG 413 ELECTRIC MOTOR 114 PLASTIC DROPPER 115 RUBBER STOPPER 116 DIPPER 217 RUBBER BAND BIG SIZE 1018 HAND STROBOSCOPE (Additionally required) 119 POWER SUPPLY 1.5-12V 3A (Additionally required) 1

Setting up:

1. Unpack and check the components.

2. Place the tank on the horizontal surface, and 4 legs.

3. Pour water into the tank; Connect the bulb to 12 V sockets of supply and DC motor to DC motor socket of supply

4. Adjust the motor support with the help of rubber bands in this way that the dipper arms with the help of rubber bands will be slightly above the water surface in the ripple tank.

5. Switch on the Power supply and adjust the speed through speed regulator until slow moving or stationary wave patterns are seen on the screen.

Setting :-

1. Attach the tank on the four adjustable legs and level it using levelling screw.

2. Fix the two L-type aluminium rods on the sides.

3. On the vertical aluminium rod using the bosshead set the light source fixed on horizontal

aluminium rod, as shown.

4. Sustain the motor vibration in the tank passing the suspension rubber bands through the hooks.

5. Add the water in the tank so that vibration just touchs the water.

6. Connect the motor and light source to power supply.

Straight parallel waves are produced by horizontal acrylic strip, or circular waves by ball ended

dipper. To observe interfrence phenomenons two ball ended dippers can be fixed in the motor

vibrator.

PURPOSE:

To view and investigate wave phenomenon in water and relate these to the behaviour of other

waves, such as sound, ultrasound, radio and light.

WAVE GENERATION:-

Circular Waves:- Attach single dipper or two dipper in the black motor support using there pin

holes.

Plane waves:- Attach the straight dipper on black motor support fixing pin holes .

Working :- Fix the dipper arm to the lower side of motor support ,so the end dips into the water

surface .Switch on the power supply . The arm vibrates making regular waves on the water

surface ,which can be seen through the stroboscope for viewing , take it in your hand and rotate

and see the waves through the hole while rotating the stroboscope. You can see the two circular

waves originating from two arms coincide at periphery, this phenomenon is interference. The

speed regulator may be used to change the frequency of the waves.

STANDING WAVES

By adjusting the frequency of the wave you can freeze any wave pattern or make the waves

appear to be moving in slow motion. This makes the wave behavior easier to observe. During

reflection ,where the incident and reflected may be seen (Use curved, straight reflector). The

wave velocity may be changed during refraction. It may be done using refraction plate . For

diffraction pattern use two straight reflector and one small reflector. Put small one in between big

straight reflector ,so that two small gaps are maintained. Use only one arm for producing waves.

The waves go through two gaps .

Please note that the wave velocity changes when depth of the water changes. The change in

wave velocity produces, variation in wavelength.(Put transparent refraction plate) This is

refraction. The white paper is used as a screen on the floor.

Generate continuous circular ripples and then continuous straight-line ripples, possible with

reflections at a straight barrier.

WAVE VELOCITY

Wave velocity is very difficult to measure except for low frequency ripples of long wavelength.

Therefore, the vibrator should be adjusted to the lowest frequency. Estimating wavelength

Generate continuous straight waves, running the motor-driven beam as slowly as possible to

produce low frequency ripples of long wavelength. Freeze the wave pattern using a stroboscope.

Find the wavelength by measuring a batch of wavelengths (say ten) on the paper on the floor and

finding the average Estimating frequency Count the number of vibrations in a given time interval

(perhaps in groups of four). One way to do this: let a thin piece of paper just touch the spindle of

the vibrator, to make audible sounds. This should not slow the motor much. Calculate the

number of waves per second.

For higher frequencies, observe the rotation of the motor using a hand stroboscope.

Estimating velocity One student should run a pencil along the paper, keeping it level with one

wave. Another student measures the time taken to travel between the two points marked on the

paper.

Calculate

speed = distance / time

NOTE: The velocity of wave pulses is easier to measure but they do not travel at the proper wave

speed, so is not appropriate.

SAFETY

Beware water on the laboratory floor. Make sure you have a sponge and bucket handy to mop up

spills immediately.

Place the power supply for the lamp on a bench, not on the floor by the tank.

Precautions :-

1. The legs of tank must be tightly fixed .

2. The connections of motor and lamp with power supply should be tight.

3. When not in use, clean the tank using sponge.

4. Do not over flow the tank with water.