Ultrasonic Range Finder
This sensor measures distances to flat surfaces placed in front of it by bouncing sound pulses off it, and measuring the round trip delay
It first emits a high frequency sound (40KHz) , and starts a stopwatch. This emitted sound pulse reflects off the nearest object, and returns to the sensor, which immediately stops the stopwatch.
Using the known speed of sound, and the measured time delay, the distance travelled by the sound pulse is calculated. The distance to the object is half of this value.
Measuring time period of a pendulum
Place an oscillating flat object in front of this sensor, such as a blackboard duster suspended by a string, and measure its time period from the plot.
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