Physics Lab Instruments

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Torsion Pendulum (5" Brass Disc) The torsion pendulum is an interesting example of simple harmonic motion, often overlooked by students. It is helpful in explaining the meaning of moment of inertia and moment of torsion and how they affect the period of vibration. The one end of suspension wire hangs from a Universal Clamp with the help of a chuck nut and the other end is clamped to a solid brass disc of 12.5cm dia and 1.25cm thick with the help of a chuck nut. A heavy metal ring of the same metal (brass) and the same outside diameter as the disc is included. When ring is placed on the disc, the moment of inertia, and therefore the period of vibration of the system, is Increased.

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Working Principle
The principle used in the measurement of velocity (ν) is based on the accurate determination of the wavelength (λ) in the medium. Ultrasonic waves of known frequency (f) are produced by a quartz crystal fixed at the bottom of the cell. These waves are reflected by a movable metallic plate kept parallel to the quartz crystal. If the separation between these two plates is exactly a whole multiple of the sound wavelength, standing waves are formed in the medium. This acoustic resonance gives rise to an electrical reaction on the generator driving the quartz crystal and the anode current of the generator becomes a maximum.

If the distance is now increased or decreased, and the variation is exactly one-half wavelength (λ /2), or multiple of it, anode current becomes maximum. From the knowledge of wavelength ( λ ) the velocity (v) can be obtained by the relation: Velocity = Wavelength x Frequency

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It's a new product from  PSAW, very easy to use and simple, most suitable for undergraduate course. The kit briefly coversthe fundamentals of Light principle like diffraction, refraction, interference etc. The kit is very handy to use, one can demonstrate all experiments in a Class room. Consist of Laser diode along other Optical Components, performed so many experimentsgiven below:-Cat. No. 1675(i) Laser light diffraction through transmission grating and Calculate its grating pitch
ii) With the help of 13 gratings you can observe Laser Light diffraction through Single Slit, double Slit, & interference ofLaser Light when it passes through wire mesh, observation of airy's pattern when passes through pin hole
iii Observe fringe pattern, when laser light passes through Fresenel Bi- Prism. We have shown some of common experiment in basic Diode Laser kits it covers all the experiement listed above it consist of aluminium extruded optical triangular type bench of one meter long of cat no 1656 with riders & sliders grating holder laser grating grating set of 13 to observe 13 different type of fringes microscopic plate Fresnel Bi Prism prism table for spectrometer right angle prism slab stainless steel scale CD & Special arrangement to hold stainless steel scale CD pin hole etc All components used are of research quality and made from laboratory grade material for long life