WAVES: SOUND AND ELECTROMAGNETISM

To begin the class we first worked on the assignment we were given the previous day in our text books, for 15 minutes. This assignment allowed us to practice the material we learnt Wednesday about: transverse and mechanical waves also leading to the mathematics of how to find the frequency and period of the waves.( The frequency would be measured in Hertz (Hz) and the period would be measured in seconds)

After working on the assignment from last day, we were given a booklet and worked on the Pre-Test on the first page for 15 minutes before watching a 20 minute video about waves involving sound and electromagnetism, the Test consisted of 10 true and false questions, on the back of the Pre-Test were definitions we also studied before watching the video.The Pre-Test was assigned to see how much we knew about waves and its sound and electromagnetism already.

There was a lot of new information in the video about waves. we learned a lot of answers to interesting questions. We learned about how sound and light waves travel. The energy of sound, explosions and earthquakes are all transported by longitudinal waves and energy of visible light is transported by electromagnetic waves.

We learned about an effect called "the Doppler Effect" which was explained in the video by a car honking its horn constantly when driving by while the listener hears the horn in different pitches as it drives by. The pitch of the sound is higher as the source approaches the listener and is lower when t retreats away from the listener.

Sound also travels in different speeds in different environments. Sound waves travel faster in a environment like water then in the air. This happens because the sound molecules are closer together making it easier to vibrate each molecule to make a sound.

We also learned about an important subatomic particle called photons, which are a particles of energy and matter propagated by electromagnetic waves. Waves can also change directions when they bounce off of a barrier, these kind of waves are called reflective waves, like echos and mirrors.

After the video we filled in the rest of the booklet to the best of our abilities. Whatever was not done we had to complete for homework. most of the questions were fill in the blank and at the bottom we had to answer 3 questions in a few sentences in our own words.

This class was very productive and I'm sure we all learned quiet a lot about waves and how they travel.

The next writer for our class blog will be Sarah Frey