Physics | Light, Sound and Waves | Sound A. Speed of Sound Kit A


This kit includes everything you need to measure the speed of sound in the classroom. • Direct method for measuring time taken for sound to travel a known distance


• The Fast Timer can be used in many other experiments


This kit provides a direct method to measure the speed of sound. Timing to microsecond accuracy is started and stopped as sound passes the microphones - see the experimental diagram. A small hammer and metal plate is included in the kit to make the necessary sharp sound. The Fast Timer, when used with mechanical start/stop gates, has many other applications e.g. in the measurement of g by free-fall.


CAPTURE THE ACTION


The Fast Timer can also be used with a single light gate controlling start/stop or by two separate light gates. A change of level of 50mV is required to start/stop timing.


For a single light gate a positive bias can be selected so the gate can be used whether obstructed or unobstructed.


Timing ranges are 1 to 999.9ms and 1 to 9999s


The kit consists of: • Fast timer • 2 x Ceramic microphones • Mini claw hammer • Metal Plate


E8R02657 kit £328.04 B. Crystal Microphone by Unilab


This low output Crystal Microphone may be used with a Power Amplifier for public address or can be connected to an oscilloscope (also via a Power Amplifier) to show audio waveforms. Fitted with 90cm screened flex and two 4mm plugs.


E8H27581 C. Amplified Microphone by Unilab B C


The amplified microphone is a great way to observe sound waves on an oscilloscope. The output level is much higher than the traditional crystal microphones giving very clear traces. Two amplified microphones can be used with a storage oscilloscope or Motion QED to measure the speed of sound.


Specification: Battery: 3 x AAA (not supplied) Gain: 125 Frequency range: 0-20kHz Output: ± 2V a.c


E8R09545 D. Tuning Fork Electric


Heavy-duty electric tuning fork. An electromagnet drives the fork to a sustained frequency of 80Hz. The tuning fork assembly and binding posts are mounted on a stable cast-metal base.


D


To show relationships between frequency, length, tension and mass or learn about Melde’s standing wave experiments with this heavy duty electric tuning fork. An electromagnet drives the fork to a sustained frequency of approx. 80Hz. One prong of the tuning fork has a captive knurled thumbscrew for performing Melde’s experiment. Amplitude of the tuning fork vibrations is varied by means of a threaded adjustment screw. Universal binding posts are finished to provide electrical power from an external source of 2 to 6 volts DC.


CP00052728 E. Tuning Forks With Hammer E F


For demonstrating the production of beat frequencies. Comprises two nickel plated forks A (440 Hz) mounted on individual boxes. One fork is provided with adjustable mass by means of which frequency may be shifted from the nominal 440 Hz. When both forks are sounded a clearly audible ‘beat’ is produced, its rate depending upon the difference in frequency between the forks.


E8R08094 F. Tuning Fork Hammer


The disc shaped rubber tuning fork hammer comes on a comfortable, polished wooden handle and is great for student use.


E8R08095 £3.53 pair £28.22 £157.50 £47.12£59.54 £37.04


334


Philip Harris is part of the Findel family


Physics


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