Question

what type of modulation is typically used by broadcasting stations to transmit pictures on television screens? amplitude frequency phase pulse

Explanation:

In television broadcasting, amplitude - modulation (AM) is typically used to transmit the picture signal. Amplitude modulation changes the amplitude of the carrier wave according to the information signal (in this case, the video signal for the picture). Frequency - modulation is more commonly used for audio in TV and radio. Phase - modulation is not the main type for picture transmission in TV. Pulse - modulation is used in some digital and specific communication scenarios but not for the typical picture transmission in traditional TV broadcasting.

Answer:

amplitude