A level Light Quizzes

A level Light Quizzes.

(Light quizzes for students doing, A level, GCE, GCSE, and necta)

In this topic, we are going to look at light in general, a very essential necessity for life.  Light allows us to see the surrounding world by distinguishing details, individual colors, movement, brightness. It has a very big impact on a human in terms of the physiology and psyche. But light also has extremely important functions in relation to a lot of biological processes that occur in our body. So we are now going to throw more light on what light is really all about.

Light
Light is a form of electromagnetic radiation with a wavelength which can be detected well by the human eye. It is a small part of the electromagnetic spectrum and radiation given off by stars like the sun for an example. Light usually exists in tiny energy packets forms called photons. Each wave has a wavelength or frequency.

Formation of light
A light source is anything that makes light. There are natural and artificial light sources. Some examples of natural light sources include the Sun, stars and candles. Some examples of artificial light sources include light bulbs, lamp posts and televisions.
Sources of light
The main source of light on Earth is the sun, the sun produces light by a nuclear reaction called fusion. Note that, as atoms of hydrogen combine to form helium, they produce vast amounts of heat and light. Also, the central core of the sun, where all the heat and light are produced, has a temperature of 15 million degrees. Other sources include, 

• Natural light sources like the sun, star and moon.
• Artificial light sources like a lamp.
• Incandescent light sources example fire.
• Luminescence light sources include some animals like fireflies.
  It is also important to note that,  when light moves from one medium (like air) to another medium (like water) it will change directions. This is a "wave-like" behavior and it is called refraction. In this case, light behaves like other waves such as sound waves. The speed of the light wave also changes when it moves from medium to medium which is a very important factor of refraction.
           The emission of free electrons from a metal surface when light of particular frequency is shone on it  is called the photoemission or the photoelectric effect. This effect alone led to the conclusion that light is made up of packets or quantum of energy.  
  These two very important properties of light are termed as the Wave-particle duality of light.

 Light is  very important topic, which students studying for their A level, GCE and GCSE, are expected to know, it plays a key role in most of their exams. Below are some quizzes that will help test you on your knowledge as far as light is concerned, for more quizzes on physics, click here and don't forget to go to our official website, gcequiz.com for more quizzes on many different subjects.

Enjoy!!!