Radioactivity was gradually understood in terms of the disintegration of atomic nuclei. The three types of radiation are alpha decay, beta decay and gamma decay. Alpha radiation occurs when an unstable nucleus breaks down so as to eject a fast-moving nucleus of helium, which consists of two protons and two neutrons.
Light is a form of energy which enables us to see objects and the straight line along which it travels is called ray of light. Reflection of Light is the process of sending back the light rays which falls on the surface of an object. The image formed due to reflection of an object on a plane mirror is at different places.
The interceptor missile is an anti-ballistic missile (ABM) which is a surface-to-air missile designed to counter ballistic missiles like intermediate range and intercontinental ballistic missiles launched from any country. It is used to deliver nuclear, chemical, biological or conventional warheads in a ballistic flight trajectory. How interceptor missile works and how it is useful is discussed in this article.
Refraction of light takes place when light travels from one medium to another. It takes place at the boundary between the two mediums. Also, we know that speed of light is different in different mediums. So, it occurs due to the change in speed of light on going from one medium to another.
Refraction is the change in direction of light when it passes from one medium to another. The working of a lens is based on the refraction of light when they pass through it. Lens is a piece of transparent glass bound by two spherical surfaces and is used to magnify objects. They are of two types convex and concave. The image produced by convex lens is enlarged and the image produced by concave lens is diminished.
Work is done when a force produces motion. And for doing work energy is required. This energy we get from the food which we eat and if work is done by machine, then energy is supplied by fuels or by electricity. This article deals with the summary of Work, Power and Energy, its mechanism, formulas and how they are related to each other in a crux form which not only clear your concepts but also help in your preparation and in solving problems.
The defence budget of US military for the fiscal year 2018 is $ 824.6 billion. This budget has a base budget of $ 574.5 billion for the development of the US Army, whereas $ 64.6 billion is set aside to fight Islamic State and war on foreign lands. America's defence spending is more than the total defence budget of top nine military spenders of the world. India's entire defence budget is $56 billion.
Resistance is the hindrance to the flow of electric charge. The obstruction posed in the way of current carrying particles by fixed particles creates resistance in an electric circuit. The measurement of the electric current in an electric circuit therefore, depends on two factors primarily i.e. Potential Difference across the ends of the conductor and Resistance of the conductor. The relationship between current and potential difference is also explained by Ohm’s Law.