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  • 1ST PERIOD - PHYSICS
  • Radio? As in those why we can hear radios?
  • Good morning, class. For today's topic, we'll discuss about electromagnetic waves, specifically radio waves.
  • Yes exactly. This is the type of electromagnetic radiation that is best known for its use in communication technologies.
  • RING
  • RING
  • RING
  • RING
  • Sorry, miss. May I take this call?
  • RING
  • This is why are able to use television, radios, and mobile phones!
  • Sure, make it quick.
  • Moving on. Because of radio waves, we are able to carry signals which we can translate into usable information.
  • Yeah I won't. I'm on class. Bye.
  • Hello mom? Do you need anything?
  • Eric, don't forget to buy eggs when you get home.
  • As you can see class, Eric demonstrated the use of radio waves when he used his phone to communicate with another person.
  • Your phones act as transceivers, transmitting one signal and receiving another. Your phone transmits its signal to the nearest antenna tower via FM.
  • In FM radio stations, it transmits broadcast information by changing the carrier wave frequency. By this, you can talk and listen at the same time because the two signals are at different frequencies.
  • So, why do we use radio waves specifically when it comes to communicating
  • That's because radio waves are transmitted easily through air, and they can be reflected to change their direction. This makes them suitable for communication
  • Yeah, that's also what I've been wondering
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