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Radiowave of constant amplitude can be produced with
Solution:
An oscillator is an electronic circuit that generates a repetitive, oscillating electronic signal, typically a sine wave or a square wave. These oscillating signals, especially at radio frequencies, are used as carrier waves in radio transmission to produce radiowaves of constant amplitude.
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An LED (Light Emitting Diode) converts electrical energy into light.
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A Rectifier converts alternating current (AC) into direct current (DC).
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A Logic gate is a basic building block of digital circuits that performs a logical operation on one or more binary inputs and produces a single binary output.
Therefore, an oscillator is the correct device for producing radiowaves of constant amplitude.