Week 5 Light - a part of the electromagnetic spectrum of radiation
Task 1 Light Introduction
First, Some History:
To the left is an example of an American LaceMaker's Lamp made and used in the 18th century (1700's). It is constructed of a maple candle holder, holding a candle. The candle is surrounded by four original blown glass balls which are filled with water.
The image below shows an etching of a lacemaker working by the light of a Lacemaker's Lamp.
What happens to light from the candle as it passes through the water-filled glass spheres?
Are there other ways to achieve this effect with light?
Robert Hooke was using the latest technology to view tissues in the 1600's. He used lenses in his microscope and used the refraction of light through water spheres to amplify and focus the available light from an oil lamp.
Bureau of Meteorology Campbell-Stokes recorder (Darwin Airport Met Office)
This glass sphere is used to measure hours of bright sunlight. Find out how it works.
When my father worked at CSR during the 1970's he had a second-story office that overlooked the car park below. He had on his window-sill a round flask filled with water. This way he could see his visitors or colleagues as they entered the car park and he could go downstairs to the Foyer to meet them. They thought he had ESP but he was using the properties of light to his advantage!
Can you explain the photograph at the top of the page using your understanding of light and its properties?
Task 2 Pop Quiz
- The natural source of all electromagnetic radiation is the _________ . It takes _____ minutes for this energy to travel to earth.
- All electromagnetic radiation is capable of travelling through _______________ .
- All electromagnetic radiation travels at the same ____________________ , which is 300 000 000 m per second.
- Electromagnetic radiation is energy emitted by vibrating _________________ .
- When photons vibrate with a high frequency they emit waves with ____________ wavelengths. An example is _______________ .
- When photons vibrate with a low frequency they emit waves with _____________ wavelengths. An example is ________________ .
- This model helps to explain how energy from the sun can be transferred to heat energy by objects like atmosphere, rocks, water and organisms on earth. Use a flow chart to demonstrate this concept.
Task 3 Changes to the way light travels; summary of light properties
Reflection and Refraction
Use the plane mirrors, curved mirrors convex lenses and concave lenses to describe the IMAGES produced.
Use the light boxes to help you discover and explain how light behaves to produce these images
The Text book pages listed on the work sheet will also help you with the terminology.
A few websites to visit to help you complete your classwork.