Question

Radio Antenna: how waves are created, through what mediums, and what types of waves (longitudinal or transverse) -how different frequencies, wavelengths, and amplitudes of waves affect the results. -If constructive/destructive interference occurs. -Most importantly - how resonance plays a part. -Other interesting info.

200 words

Answer 1

Okay, as we know that radio waves are a type of electromagnetic radiation with wavelengths longer than infrared part. Most of the astronomical objects emit radio waves. Artificially, these are generated by transmitters and receivers. In this, electrons move back and forth in a wire to emit radio waves.

we know that waves that vibrate at right angles to their direction of propagation are transverse waves. As in case of radio waves, the oscillations are perpendicular to the direction of propagation. Therefore, we can say that radio waves are transverse waves.

First of all, let us have a look on what is constructive and destructive interference.

Constructive interference occurs when the wave amplitudes add to each other, thus creating a wave of greater amplitude.

Destructive interference occurs when the wave amplitudes oppose each other, resulting in waves of reduced amplitude.

Radio waves can have varied frequencies which can go as high as 300 GHz. The amplitude will increase or decrease depending on the distance between transmitter and receiver.

Now, let's talk about resonance, we know that radio waves oscillate , the electrons in the antenna oscillate and the radio circuit oscillates, now when all these are in sync with each other , then there is resonance condition. So, to get best signal and clear radio waves, resonance must be established means if we tune our receiver to the same frequency as that of transmitter then we will get the best signals because now receiver resonates with radio wave.