The only way to truly test if a variable is undefined is to do the following. Remember, undefined is an object in Javascript. To determine if a variable or object property exists, It is good to compare to keyword undefined or you can also check the type of the object to string âundefinedâ. In the following JavaScript code we compare the num to the undefined in both way.
Nuclear waste -- The waste from nuclear power plants will be toxic for humans for more than 100,000 years. Itâs untenable now to secure and store all of the waste from the plants that exist. To scale up to 2,500 or 3,000, let alone 17,000 plants is unthinkable.
Nuclear energy is our most concentrated form of energy. In other words, we get the most useable energy from smaller amounts of nuclear energy sources. Examples of Nuclear Energy: 1. A fission reaction at a nuclear power plant provides enough energy to give electricity to large cities.2. The fusion reaction in the sun provides our planet with all of the energy it needs for living organisms to survive. 3. An uncontrolled fission reaction provides the destructive force of a nuclear bomb.uclear energy is energy that is stored within the nucleus of atoms. The only way for this energy to be released is through the splitting of or joining of atomic nuclei.