Double electromagnetism spot instrument-based standing wave experiment demonstrator

Abstract

The invention relates to a double electromagnetism spot instrument-based standing wave experiment demonstrator which comprises a left box body and a right box body of a vibration source, a pair of cylindrical support rods, a rope body, a power supply for a student, a variable-frequency power supply, five electromagnetic ticker timers, five switches and a signal reflecting level adjusting rod, wherein the left box body of the vibration source is of an L-shaped box structure, and four electromagnetic ticker timers are arranged on the upper surface of the left box body of the vibration source; and the right box body is also of an L-shaped box structure, and one electromagnetic ticker timer E powered by the variable-frequency power supply of which the frequency is adjustable between 1Hz and 100Hz is arranged on the upper surface of the right box body. The double electromagnetism spot instrument-based standing wave experiment demonstrator has the beneficial effects that (1) the standing wave experiment demonstrator is capable of assisting in understanding the relationship among a wave velocity, a frequency and a wavelength through comparing standing waves on four ropes; and (2) when the frequency of one electromagnetic ticker timer is kept invariable and the frequency of another electromagnetic ticker timer changes, stable standing waves can be formed only if the two electromagnetic ticker timers are the same in frequency, thereby understanding a superposition principle of the waves.

Description

technical field [0001] The invention relates to a standing wave demonstration device, in particular to a standing wave experiment demonstration device based on double electromagnetic inkers. Background technique [0002] Patent No. 200910045097.7 discloses a wall-mounted standing wave demonstration board, which can solve the problem of students calling out one, two, or three standing waves during class time. It is interactive and small in size, and is suitable for students to use. How many standing waves can be produced by elastic ropes of the same length and made of different materials? The students can’t answer, so it is necessary to invent a standing wave demonstration and comparison device, and there is no such comparison device on the market. That is, there is no device for demonstrating the superposition of standing waves by two electromagnetic dotting timers of different or the same frequency in the physical laboratory equipment of middle school at present. When the f...

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Problems solved by technology

[0002] Patent No. 200910045097.7 discloses a wall-mounted standing wave demonstration board, which can solve the problem of students calling out one, two, or three standing waves during class time. It is interactive and small in size, and is suitable for students to use. How many standing waves can be produced by elastic ropes of the same length and made of different materials? The students can’t answer, so it is necessary to invent a standing wave demonstration and comparison device, and there is no such comparison device on the market. That is, there is no device for demonstrating the superposition of standing waves by two electromagnetic dotting timers of different or the same frequency in the physical laboratory equipment of middle school at present. When the frequency of an electromagnetic dotting timer is kept constant and the frequency of an electromagnetic dotting timer is changed , observe how the standing wave superposition effect is, the students have not personally experienced it, so they cannot describe its waveform characteristics in words

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