Which of the following best describes how wireless telephones are able to receive and produce sound from one person to another?
A.
Electromagnetic waves are received and then vibrate a speaker which produces additional electromagnetic waves.
B.
Sound waves are received and then vibrate a speaker which produces electromagnetic waves.
C.
Sound waves are received and then vibrate a speaker which produces additional sound waves.
D.
Electromagnetic waves are received and then vibrate a speaker which produces sound waves.

D.

Electromagnetic waves are received and then vibrate a speaker which produces sound waves.

Explanation:

The telephone has a receiver-transducer component that can receive electromagnetic wave - radio waves spectrum- and transform them into electric energy. This electric energy is then transformed into sound energy by a speaker. This is how we're able to listen to a phone call.

The opposite happens when we speak on the phone. The sound energy is transformed into electric energy by a microphone – the reverse of a speaker.  The transducer now changes the electric energy into electromagnetic waves that travel through space to the recipient in the phone conversation.

answer is: nuclear fusion produces elements that are heavier than helium.

nuclei combine to form a heavier nucleus, releasing energy.  

for example, fusion of hydrogen atoms at the sun.  

this fusion nuclear reaction is in the inner core of the sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).  

the inner core is the central region of the sun and all solar energy is produced in the core by nuclear fusion.