the particle nature of light

Scattering is a general physical process whereby some forms of radiation, such as light or moving particles, for example, are forced to deviate from a straight trajectory by one or more localized non-uniformities in the medium through which it passes. A large number of mole..

Intensive investigation by scientists over the years led to the development of a mental model (the minuscule particles couldn't be actually seen at that time) known as 'dynamic particle model'. All matter is assumed to be made up of particles that are very small, whic..

General Characteristics of Natural Radioactivity - It is a nuclear phenomenon. It is due to the instability of the nucleus. It is a spontaneous, continuous and irreversible process. It is independent of external factors such as pressure, temperature, state of substance, electrical field, ..

Nature of the Image Formed by a Plane Reflecting Surface - An image can be real or virtual. A real image is formed when the rays of light actually intersect after reflection. A virtual image is formed when the light rays after reflection do not actually intersect but a..

In this type of reflex, the brain is not involved. The receptor is stimulated which is conducted to the spinal cord by the effector. The effector neuron from the spinal cord conducts a response to the muscle or the gland. This causes an immediate reaction. It does not involve any thinking or reason..

The Photoelectric Effect - When light of sufficiently small wavelength is incident on a metal surface, electrons are ejected from the metal. This phenomenon is called as 'photoelectric effect' and the ejected electrons are called as 'photoelectrons..

In this type of reflex, the brain is not involved. The receptor is stimulated which is conducted to the spinal cord by the effector. The effector neuron from the spinal cord conducts a response to the muscle or the gland. This causes an immediate reaction. It does not involve any thinking or reaso..

Introduction - The Environment influences an organism's life in many ways. It is everything that surrounds an organism and it includes physical and biological components. The physical components of the environment are soil, water, air, light and temperature. These are termed as abiotic co..

Gravitational force - It is the force of attraction between any two bodies in the universe. The gravitational force is inversely proportional to the square of the distance between the two bodies and directly proportional to the product of the masses of two bodies. Gravitational force is small when ..

Physicists have categorized all forces occurring in nature under gravitational, electromagnetic, strong nuclear and weak nuclear forces. Both gravitational and electromagnetic forces can be expressed as inverse square laws. But nuclear forces cannot be expressed as a simple formula. They ..