Millikan Oil Drop Apparatus
The Millikan Oil Drop Experiment is one of the most popular experiments in undergraduate physics for several reasons:
· the experimental principle is straight-forward and easy to understand;
· it measures a fundamental atomic constant using a method that won its originator, Robert Millikan, the Nobel Prize;
· the observation of the effects of one or more electrons upon oil drops in an electric field provides a striking demonstration of the quantized nature of electricity.
Clear droplet observation and low droplet drift are essential for success with Millikan’s classic experiment.
Accuracy in the Oil Drop Experiment depends on the student’s ability to accurately measure all the variables involved: plate voltage, plate separation, time and distance of droplet rise and fall, temperature, oil density, etc. Extreme care taken in the design and manufacture of this unit ensures that the student’s best efforts will be rewarded with more accurate results.
Minimum Electric Field Distortion--A 0.5 mm diameter droplet entry hole in the top capacitor plate has a negligible effect on the electric field.
· Droplet Hole Cover -- Prevents additional droplets from entering the chamber once the experiment has started.
· Polished Surfaces -- Polished surfaces on the plate spacer minimize absorption of light (and heat) through the chamber walls.
· Electrical Connection -- Electrical connection to the top plate.Easy Cleaning -- The condenser system easily disassembles for cleaning and inspection
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Owing to the support of professionals, we have been able to emerge as one of the leading manufacturers, suppliers, and exporters of high quality Copper Calorimeter. This product is used for measuring the heat of chemical reactions or physical changes as well as their heat capacity. Moreover, our product is made from finest quality copper 75 x 50 and 100 x 75 diameter.
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FET based marginal R.F. Oscillator
· Digital diaplay of frequency
· Excellent peaks display
· Digital display of Helmoltz Coil Current
· Compatible with general pupose CRO in X-Y mode
In recent years Magnetic Resonance has developed into a very useful and powerful tool in solid state research. In this method, use is made of the Zeeman interaction of the magnetic dipoles associated with the nucleus or electron, when placed in an external magnetic field. Accordingly, they are identified as NMR (Nuclear Magnetic Resonance) or ESR (Electron Spin Resonance). This form of spectroscopy finds many applications in the investigation of crystal structures, environmental effects, dynamic effects, defects in solids and in many diverse branches of Physics, Chemistry and Biology.
Elementary Magnetic Resonance
· DE = (gµ0H)mj
· DE = gµ0H 0r = hn0
I sec, we get 2.8MHz/gauss
The first stage of the ESR circuit consists of a critically adjusted (marginal) radio frequency oscillator with 4-digit frequency display. This type of oscillator is required here, so that the slightest increase in its load decreases the amplitude of oscillation to an appreciable extent. The sample is kept inside the tank coil of the oscillator, which in turn, is placed in the 50Hz magnetic field, generated by the Helmholtz coils. At resonance, i.e. when the frequency of oscillation equal to the Larmour’s frequency of the sample, the oscillator amplitude registeres a dip due to the absorption of power by the sample. This obviously, occurs periodically four times in each complete cycle of the supply voltage. The result is an amplitude modulated carrier which is then detected using a FET demodulator and amplified by an op-amp circuit.
Highly stabilised and almost ripple free power supply for the above circuit is obtained using an integrated circuit regulator.
This can compensate the undermined phase difference which may be introduced in the amplification stages of the spectrometer and oscilloscope.
50Hz Sweep Unit
A 50Hz current flows through Helmholtz coils which provides a low frequency magnetic field to the sample. As the resonance is observed at few gauss only, no static magnetic field is applied.
An auxanometer is an apparatus for measuring increase or rate of growth in plants.
In case of an arc-auxanometer there is a wire fixed with the plant apex on one end and a dead-weight on the other. It passes over a pulley which has a pointer attached to it. When the plant's height increases, the pulley rotates and the pointer moves on a circular scale to directly give the magnitude of growth.
Wet and dry bulb thermometer,
an instrument used to measure the relative humidity of the atmosphere. It consists of a thermometer with a bulb that is wet or moist and one that is kept dry. The relative humidity is calculated from the difference in readings of the thermometers when water evaporates from the wet bulb, decreasing its temperature.
Humidity chart also supplied with the instrument.
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magnet kit for school level.
bar magnet, horse shoe magnet, ring magnet etc.
We are manufacturers and exporters of types of physics instruments.floating ring magnets
Do ask for other details and prices via email , sms or phone.
Micrometer screw gauge, is a device incorporating a calibrated screw widely used for precise measurement of components in mechanical engineering and machining as well as most mechanical trades, along with other metrological instruments such as dial, vernier, and digital calipers. Micrometers are usually, but not always, in the form of calipers (opposing ends joined by a frame), which is why micrometer caliper is another common name. The spindle is a very accurately machined screw and the object to be measured is placed between the spindle and the anvil. The spindle is moved by turning the ratchet knob or thimble until the object to be measured is lightly touched by both the spindle and the anvil.
Micrometers are also used in telescopes or microscopes to measure the apparent diameter of celestial bodies or microscopic objects.
Ranges are 10 mm, 15 mm,20,25 mm x1/100 mm
Spherometer is an instrument for the precise measurement of the radius of a sphere. Originally, these instruments were primarily used by opticians to measure the curvature of the surface of a lens.
The usual form consists of a fine screw moving in a nut carried on the centre of a small three-legged table or frame; the feet forming the vertices of an equilateral triangle. The lower end of the screw and those of the table legs are finely tapered and terminate in hemispheres, so that each rests on a point. If the screw has two turns of the thread to the millimetre the head is usually divided into 50 equal parts, so that differences of 0.01 millimetre may be measured without using a vernier. A lens, however, may be fitted, in order to magnify the scale divisions. A vertical scale fastened to the table indicates the number of whole turns of the screw and serves as an index for reading the divisions on the head.
A contact-lever, delicate level or electric contact arrangement may be attached to the spherometer in order to indicate the moment of touching more precisely than is possible by the sense of touch. To measure the radius of a sphere—e.g. the curvature of a lens—the spherometer is levelled and read, then placed on the sphere, adjusted until the four points exert equal pressure, and read again. The difference gives the thickness of that portion of the sphere cut off by a plane passing through the three feet.
The Vernier caliper is an extremely precise measuring instrument; the reading error is 1/20 mm = 0.05 mm.
Close the jaws lightly on the object to be measured.
If you are measuring something with a round cross section, make sure that the axis of the object is perpendicular to the caliper. This is necessary to ensure that you are measuring the full diameter and not merely a chord.
Ignore the top scale, which is calibrated in inches.
Use the bottom scale, which is in metric units.
Notice that there is a fixed scale and a sliding scale.
The boldface numbers on the fixed scale are centimeters.
The tick marks on the fixed scale between the boldface numbers are millimeters.
There are ten tick marks on the sliding scale. The left-most tick mark on the sliding scale will let you read from the fixed scale the number of whole millimeters that the jaws are opened.
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