What happens when the buzzer frequency increases?, The sound becomes lower, The sound becomes higher, The buzzer turns into an LED, The ESP32 stops working, What does frequency control in a buzzer activity?, The color of the buzzer, The size of the circuit, The pitch of the sound, The number of wires only, Why is a buzzer useful for learning about frequency?, Because it lets us hear changes in frequency, Because it stores digital data, Because it replaces the ESP32 CPU, Because it measures temperature

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