Group+1

Members: Crystal Heying Glendon Minh Dat Arvin

Answer for discussion questions: __Lesson 1__ 1. Energy

2. a) Transverse wave b) Longitudinal wave c) Longitudinal wave

3.Transverse wave: Light wave and electromagnetic wave Longitudinal wave: Sound wave, tsunami wave and vibration in gases

4. Transverse waves are wave that travel in a direction **__perpendicular__** to the direction of the vibrations and longitudinal wave are wave that travel in a direction **__parallel__** to the direction of vibrations

__Lesson 2__ 1. (i) crest/peak (ii) trough (iii) amplitude (iv) wave length

2. (i)Transverse wave (ii) Point A and D are the Crest,point B and F are the Trough. (iii) Point E (iv) 1cm (v) 2cm

__Alien's Attack__
After a re search done by our groups of scientist we found out that the only way to destroy the alien were to use light and sound as both have waves have high **frequency** and **amplitude**. The frequency of an oscillating sound wave helps determine its pitch, while the frequency of a light wave helps determine its color. Amplitude is the magnitude of change in the repetitive variation variable with each repetitive variation within an oscillating system. With both high frequency and amplitude it contain a large amount of **energy** which is able to destroy the alien but it is able to move at a **speed** of 500 m/s ,hence it is not easy to destroy the alien in an open place. Therefore,we have decided to lure the alien to a place that is full of hollow bar surrounding it and with light shining onto the area then hit all the hollow bars with other hollow bar to create sound and light waves.