The transmission system at a radio station uses a/an to convert s direct current into a high frequency alternating current.

The transmission system at a radio station uses an oscillator to convert direct current into a high frequency alternating current.

Answer

Oscillator

Reason

Oscillators is a circuit  that changes  direct current from to alternating current (AC) signal.

Oscillator often produces  periodic, oscillating electronic signal, a sine wave or a square wave.

Therefore an oscillator is used to convert direct current into a high frequency alternating current.

answer: 0.20

explanation: this can only be the answew because all the other measuremnets are not close

a high pressure system is a dense air mass that is usually cooler and drier than the surrounding air. a low pressure system is a less dense air mass that is usually wetter and warmer than the surrounding air.

in general, areas that experience high atmospheric pressure also experience fair weather. low pressure systems can cause the formation of clouds and storms. air usually flows from areas of high pressure to areas of low pressure..