Class 11 Exam > Class 11 Videos > Fundamental Units - Units and Measurement, Class 11, Physics
Fundamental Units - Units and Measurement, Class 11, Physics Video Lecture
FAQs on Fundamental Units - Units and Measurement, Class 11, Physics Video Lecture
| 1. What are fundamental units in physics? |  |
Ans. Fundamental units in physics are the basic units of measurement that are used to express physical quantities. These units are independent and cannot be derived from any other units. Examples of fundamental units include length, mass, time, electric current, temperature, amount of substance, and luminous intensity.
| 2. How are fundamental units different from derived units? | |
Ans. Fundamental units are the basic units of measurement that are independent and cannot be derived from any other units. Derived units, on the other hand, are formed by combining fundamental units and are used to express physical quantities that are derived from these fundamental units. For example, the unit of velocity is derived by dividing the unit of length by the unit of time.
| 3. Can fundamental units be changed or modified? | |
Ans. No, fundamental units cannot be changed or modified. They are universally accepted and form the basis of the International System of Units (SI). Any changes or modifications to the fundamental units would require a complete overhaul of the entire system of measurement.
| 4. How are fundamental units used in practical applications? | |
Ans. Fundamental units are used in various practical applications across different fields of science and engineering. For example, in physics, fundamental units are used to measure quantities such as distance, mass, time, and temperature. In engineering, these units are used to measure quantities such as force, pressure, energy, and power. By using a standardized system of fundamental units, scientists and engineers can communicate and compare measurements accurately.
| 5. Can there be different systems of fundamental units? | |
Ans. Yes, historically, different systems of fundamental units have been used. However, the International System of Units (SI) is the most widely accepted and used system today. It provides a consistent and standardized set of fundamental units that are used internationally for scientific and engineering purposes. The SI system ensures uniformity and allows for easy conversion between different units.
Text Transcript from Video
fundamental units and definition in this
module we will discuss about definitions
of fundamental units in SI Mita M it is
a unit of length let us see the path of
light in a vacuum now we can define the
unit is the length of the path travelled
by light in vacuum during a time
interval of 1 by 299,792,458 or 4 second
second as it is a unit of time let us
see there is cesium 133 atom it is
defined as the duration of 9,192,631,770
periods of two radiations corresponding
to the transition between two hyperfine
levels of the cesium 133 atom kilogram
kg it is a unit of mass the kilogram is
equal to the mass of the International
prototype of the kilogram
platinum-iridium alloy cylinder kept at
International Bureau of weights and
measures
it serves near Paris of France ampere a
this is the unit of electric current the
ampere is that constant current which if
maintained in two straight parallel
conductors of infinite length of
negligible circular cross-section and
placed 1 meter apart in vacuum would
produce between these conductors a force
equal to 2 into 10 to the power minus 7
Newton per unit of length Kelvin this is
the unit of the thermodynamic
temperature the Kelvin is the fraction 1
by 273.16 of the thermodynamic
temperature of the triple point of
water mole this is the unit of quantity
of substance the mole is the amount of
substance of a system which contains as
many elementary entities as there are
atoms in 0.01 to kilograms of carbon 12
Candela
the Candela is the unit of luminous
intensity it is defined as in a given
direction of a source that emits
monochromatic radiation of frequency 540
into 10 to the power 12 Hertz and that
has a radiant intensity in that
direction of 1 by 683 wor thus the
radiant in that direction radiant
radiant rad this is the unit of plane
angle it is defined as the angle
subtended at the centre of a circle by
an arc whose length is equal to the
radius of the circle the Radian SR this
is the unit of solid angle stay Radian
is defined as a solid angle subtended at
the center of a sphere by its surface
whose area is equal to the square of the
radius of the sphere thank you
module we will discuss about definitions
of fundamental units in SI Mita M it is
a unit of length let us see the path of
light in a vacuum now we can define the
unit is the length of the path travelled
by light in vacuum during a time
interval of 1 by 299,792,458 or 4 second
second as it is a unit of time let us
see there is cesium 133 atom it is
defined as the duration of 9,192,631,770
periods of two radiations corresponding
to the transition between two hyperfine
levels of the cesium 133 atom kilogram
kg it is a unit of mass the kilogram is
equal to the mass of the International
prototype of the kilogram
platinum-iridium alloy cylinder kept at
International Bureau of weights and
measures
it serves near Paris of France ampere a
this is the unit of electric current the
ampere is that constant current which if
maintained in two straight parallel
conductors of infinite length of
negligible circular cross-section and
placed 1 meter apart in vacuum would
produce between these conductors a force
equal to 2 into 10 to the power minus 7
Newton per unit of length Kelvin this is
the unit of the thermodynamic
temperature the Kelvin is the fraction 1
by 273.16 of the thermodynamic
temperature of the triple point of
water mole this is the unit of quantity
of substance the mole is the amount of
substance of a system which contains as
many elementary entities as there are
atoms in 0.01 to kilograms of carbon 12
Candela
the Candela is the unit of luminous
intensity it is defined as in a given
direction of a source that emits
monochromatic radiation of frequency 540
into 10 to the power 12 Hertz and that
has a radiant intensity in that
direction of 1 by 683 wor thus the
radiant in that direction radiant
radiant rad this is the unit of plane
angle it is defined as the angle
subtended at the centre of a circle by
an arc whose length is equal to the
radius of the circle the Radian SR this
is the unit of solid angle stay Radian
is defined as a solid angle subtended at
the center of a sphere by its surface
whose area is equal to the square of the
radius of the sphere thank you
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Nov 07, 2024 Last updated |
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