Answer: One possible way to design an instrument that can play three different frequencies using household items is to create a set of tuned glass bottles.
Explanation: Here are the steps to follow:
Materials needed:
Three glass bottles of different sizes (e.g., small, medium, and large)
Water
Spoon or stick for tapping the bottles
Instructions:
Fill the first glass bottle with a small amount of water, around one-third full.
Gently tap the bottle with the spoon or stick and listen to the sound it produces.
Adjust the water level in the bottle by adding or removing small amounts of water until you get a desired frequency.
Repeat steps 1-3 with the second and third bottles, but use different water levels to produce different frequencies.
Arrange the bottles in order from the highest frequency to the lowest frequency.
To play the instrument, strike each bottle with the spoon or stick in turn to produce the different frequencies.
By adjusting the water level in each bottle, you can create three different frequencies. The smaller the bottle, the higher the frequency it will produce. Conversely, the larger the bottle, the lower the frequency it will produce.