performance task 1
Storyboard Text
- Performance Task no. 1 in Science
- Rasco, Harlyn Joy R.10 - Esteban A
- When you listen to the radio, watch tv or cook dinner in a microwave oven you are using Electromagnetic Wave.
- Radio waves, television waves, and microwaves are all types of electromagnetic waves. They only different from each other in wavelength. Wavelength is the distance between one wave crest to the next. Waves in the electromagnetic spectrum vary in size from very long radio waves the size of buildings, to very short gamma-rays smaller than the size of the nucleus of an atom.
- Each of these three quantities for describing EM Radiation are related to each other in a precise mathematical way. But why have three ways of describing things, each with a different set of physical units?
- Electromagnetic Radiation can be expressed in terms of energy, wavelength, or frequency . Frequency is measured in cycles per second, or Hertz. Wavelength is measured in meters. Energy is measured in Electron Volts.
- The short answer is that scientists don't like to use numbers any bigger or smaller than they have to. It is much easier to say or write 'two kilometers' than 'two thousand meters'. Generally, scientist use whatever units are easiest for the type of EM radiation they work with.
- Astronomers who study radio waves tend to use wavelengths or frequencies. Most of the part of EM spectrum falls in the range from about 1 cm to 1 km, which is 30 gigahertz (GHz) to 300 kilohertz (KHz) in frequencies. The radio is a very broad part of EM spectrum
- Your radio captures radio waves emitted by radio stations, bringing your favorite tunes. Radio waves are also emitted by stars and gases in space.
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