Definitions of base units
Metre
The distance travelled by light in vacuum during a time interval of 1/299,792,458 second is called 1 metre.
Kilogram
The Kilogram is the mass of cylinder made of planitum-iridium alloy kept at International Bureau of Weights at Sevres near Paris in France.
Second
The time duration in 9,192,631,770 time periods of the selected transition of radiation of Cesium-133 atom is defined as 1 s.
Ampere
It is the steady current (a unit of measure of the rate of electron flow ) that when flowing in straight parallel wires of infinite length and negligible cross section, separated by a distance of one meter in free space, produces a force between the wires of 2 × 10-7 newtons per meter of length.
The ampere is named after Andre Marie Ampere, French physicist (1775-1836).
Kelvin
A temperature scale in which The fraction 1/273.16) of the thermodynamic temperature of triple point of water is called the Kelvin.
Mole
The amount of a substance that contain as many elementary entities (molecules, atoms and ions if the substance is monatomic) as there are number of atoms in 0.012 kg of carbon-12 is called a mole.The number is 6.0225 × 1023, or Avogadro's number. Also called gram molecule.
Candela
It is the Standard International (SI) unit to measure the brightness of a source of light ( luminous intensity. one square centimeter of a blackbody at the freezing point of platinum emits one-sixtieth of a candela of radiation.
Thursday, June 3, 2010
Introduction to physics
Physical science analyze the branches of natural science and the study of non living things. Examples of physical sciences are physics, chemistry, geography,meteorology,hydrology, geology, astronomy, astrology and oceanography.
Definition of Physics- Physics is a natural science which involves the study of matter and their manifestation in different natural phenomena.
Physics come from the greek word 'physis' meaning "nature'. Physics is a fundamental science because the other natural sciences like biology, chemistry, geology,astronmomy, geoscience etc deal with systems that use and obey the laws of physics.
Definition of Physics- Physics is a natural science which involves the study of matter and their manifestation in different natural phenomena.
Physics come from the greek word 'physis' meaning "nature'. Physics is a fundamental science because the other natural sciences like biology, chemistry, geology,astronmomy, geoscience etc deal with systems that use and obey the laws of physics.
Wednesday, May 19, 2010
Tuesday, May 18, 2010
iit entrance- Wavemotion
longitudinal wave
This animation depicts Transverse and Longitudinal waves on a spring.
For transverse waves the disturbance (in this case the displacement of the slinky) is PERPENDICULAR to the direction the wave is moving (in this case along the slinky). For Longitudinal waves the disturbance is ALONG the direction the wave is moving. In some materials these two waves go at different speeds, and in fluids (liquids or gases) transverse sound waves don't go at all! (This is important for earthquake vibrations going through the earth's core).
A transverse wave is created by a disturbance that is perpendicular to the direction the wave will travel.
A longitudinal wave is created by a disturbance that is along the direction the wave will travel.
Physics: Transverse vs. longitudinal waves. Wave graphs. Velocity (v) versus frequency (f); frequency (f) versus angular frequency (ω)
Wednesday, December 23, 2009
Light , Reflection and Refraction
Refraction
When a ray of light reach the boundary between two different substances, some light is reflected, and some light is refracted. The semi-cylindrical piece of glass has a higher index of refraction.
Rainbow
Light refraction and reflection
Concave lens - physics experiment
Lens that possesses at least one surface that curves inwards. It is a diverging lens, spreading out those light rays that have been refracted through it. A concave lens is thinner at its centre than at its edges, and is used to correct short-sightedness (myopia).
Converging lenses a beginners guide for A level
Lenses
When a ray of light reach the boundary between two different substances, some light is reflected, and some light is refracted. The semi-cylindrical piece of glass has a higher index of refraction.
Rainbow
Light refraction and reflection
Concave lens - physics experiment
Lens that possesses at least one surface that curves inwards. It is a diverging lens, spreading out those light rays that have been refracted through it. A concave lens is thinner at its centre than at its edges, and is used to correct short-sightedness (myopia).
Converging lenses a beginners guide for A level
Lenses
Labels:
10 cbse science notes,
light,
physics,
reflection,
refraction
Thursday, November 19, 2009
Magnetic effects
Magnetic effects
Magnetism 2
Electricity & Magnetism Hand Rules (part one)
What is the magnetic field?
Origin of Earth's Magnetic Field
Direct current electric motor
Magnetism 2
Electricity & Magnetism Hand Rules (part one)
What is the magnetic field?
Origin of Earth's Magnetic Field
Direct current electric motor
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