The document discusses different methods of measuring length. It describes using meters as the standard unit of length and using other units like feet and inches for measuring specific lengths. It also discusses using kilometers to measure vehicle distances. For very large distances that can't be measured with standard instruments, the document covers using the parallax method and echo method, with the parallax method utilizing angle measurements and the echo method calculating distance based on the time it takes for a sound to return. The document notes the wide range of lengths that can be measured, from microscopic scales like atoms to macroscopic scales like the size of the universe.
This is a summary of the topic "Physical quantities, units and measurement" in the GCE O levels subject: Physics. Students taking either the combined science (chemistry/physics) or pure Physics will find this useful. These slides are prepared according to the learning outcomes required by the examinations board.
This is a summary of the topic "Physical quantities, units and measurement" in the GCE O levels subject: Physics. Students taking either the combined science (chemistry/physics) or pure Physics will find this useful. These slides are prepared according to the learning outcomes required by the examinations board.
This slide its all about Sound and Light. The characteristics of sound waves, the amplitude, frequency, and a wavelength. And for Lights, I have here a wave theory of light, colors, brightness, intensity. and others.. So, enjoy my slide, I work it for every one.
This presentation covers vertical motion under gravity, effect of air resistance on free fall & graphs of free fall. I hope this PPT will be helpful for instructors as well as students.
This slide its all about Sound and Light. The characteristics of sound waves, the amplitude, frequency, and a wavelength. And for Lights, I have here a wave theory of light, colors, brightness, intensity. and others.. So, enjoy my slide, I work it for every one.
This presentation covers vertical motion under gravity, effect of air resistance on free fall & graphs of free fall. I hope this PPT will be helpful for instructors as well as students.
Parallel Plate Capacitors are the type of capacitors which are formed by arrangement of electrodes and insulating material (dielectric). The two conducting plates act as electrodes which are separated by a dielectric between them. Copy the link given below and paste it in new browser window to get more information on The Parallel Plate Capacitor www.askiitians.com/iit-jee-electrostatics/the-parallel-plate-capacitor/
S.I or International System of Units was founded in 1971 by CGPM committee. The system is widely used all over the world and is also known as Metric System if units. Copy the link given below and paste it in new browser window to get more information on The International system of Units www.askiitians.com/iit-jee-physics/general-physics/the-international-system-of-units/
Consider a glass with a hollow sphere and a reflecting surface. This reflecting hollow surface of sphere of which either sides are polished, forms the spherical mirrors. Spherical Mirrors are of two types: (a) Concave Mirror Copy the link given below and paste it in new browser window to get more information on Reflection of Light by Spherical Mirrors www.askiitians.com/iit-jee-ray-optics/reflection-of-light-by-spherical-mirrors/
Permanent Magnets: As the name suggests these are the type of magnets that can retain their magnetism for a considerate amount of time. They are usually made of hard materials which are strongly magnetized. Copy the link given below and paste it in new browser window to get more information on Permanent Magnets and Electromagnets www.askiitians.com/iit-jee-magnetism/permanent-magnets-and-electromagnets/
Magnetic Field: The magnetic field is an imaginary line of force around a magnet which enables other ferromagnetic materials to get repelled or attracted towards it. Copy the link given below and paste it in new browser window to get more information on Magnetic Properties of Materials www.askiitians.com/iit-jee-magnetism/magnetic-properties-of-materials/
The Magnetic behaviour of a magnet is characterized by the alignment of the atoms inside a substance. When a ferromagnetic substance is brought under the application of a strong external magnetic field. Copy the link given below and paste it in new browser window to get more information on Magnetisation and Magnetic Intensity www.askiitians.com/iit-jee-magnetism/magnetisation-and-magnetic-intensity/
Various optical instruments have been designed, using the property of reflection and refraction. Copy the link given below and paste it in new browser window to get more information on Introduction Of Ray Optics and Optical Instruments www.askiitians.com/iit-jee-ray-optics/introduction-of-ray-optics-and-optical-instruments/
Electrical Current is the flow of charged particles. The flow of charges will be constant in current electricity. For the current to flow we need a circuit. The electrons in a current flows from negative to positive. Copy the link given below and paste it in new browser window to get more information on Introduction of Current Electricity www.askiitians.com/iit-jee-electric-current/introduction-of-current-electricity/
The force felt by a unit positive charge or test charge when it's kept near a charge is called Electric Field. The electric field is also defined as the region which attracts or repels a charge. The electric field is a vector quantity and it denoted by E. Copy the link given below and paste it in new browser window to get more information on Electric Field www.askiitians.com/iit-jee-electrostatics/electric-field/
As electric field, that is, force per unit charge is a vector quantity; it can be used to represent overall effect of electric field in system of electric charges. Similarly electric field can be used in pictorial form to describe the overall intensity of the field. Copy the link given below and paste it in new browser window to get more information on Electric Field Lines www.askiitians.com/iit-jee-electrostatics/electric-field-lines/
Dielectrics are usually placed between the two plates of parallel plate capacitors. They can fully occupy the region between the plates or can partially occupy. Copy the link given below and paste it in new browser window to get more information on Effect of Dielectric on Capacitance www.askiitians.com/iit-jee-electrostatics/effect-of-dielectric-on-capacitance/
The nature of physical quantity is described by nature of its dimensions. When we observe an object, the first thing we notice is the dimensions. In fact, we are also defined or observed with respect to our dimensions that is, height, weight, the amount of flesh etc. Copy the link given below and paste it in new browser window to get more information on Dimensions of Physical Quantities www.askiitians.com/iit-jee-physics/general-physics/dimensions-of-physical-quantities/
The expressions or formulae which tell us how and which of the fundamental quantities are present in a physical quantity are known as the Dimensional Formula of the Physical Quantity. The equations obtained when we equal a physical quantity with its dimensional formulae are called Dimensional Equations. Copy the link given below and paste it in new browser window to get more information on Dimensional Formulae and Dimensional Equations www.askiitians.com/iit-jee-physics/general-physics/dimensional-formulae-and-dimensional-equations/
Understanding dimensions is of utmost importance as it helps us in studying the nature of physical quantities mathematically. The basic concept of dimensions is that we can add or subtract only those quantities which have same dimensions. Copy the link given below and paste it in new browser window to get more information on Dimensional Analysis and its Applications www.askiitians.com/iit-jee-physics/general-physics/dimensional-analysis-and-its-applications/
Every physical phenomenon in the Physics world involves some sort of attractions and repulsions and make the world exist in a special form. It is because of attraction and repulsions between particles that the environment remains in a well-equipped and well balanced environment. Copy the link given below and paste it in new browser window to get more information on Coulomb’S Law www.askiitians.com/iit-jee-electrostatics/coulombs-law/
You must have experienced a feeling of electric shock while opening the window of your car or coming in contact with wires in wet condition. Have you ever tried why you experience this shock feeling? Copy the link given below and paste it in new browser window to get more information on Conductors and Insulators www.askiitians.com/iit-jee-electrostatics/conductors-and-insulators/
Electrical current is the flow of charged particles. The flow of charges will be constant in current electricity. Electric current flows from higher electric potential to lower electric potential. For the current to flow, it requires a circuit which is closed loop of a conducting material. Copy the link given below and paste it in new browser window to get more information on Combination of Resistors — Series and Parallel www.askiitians.com/iit-jee-electric-current/combination-of-resistors-series-and-parallel/
Luigi Galvani an Italian scientist, while cutting a frog’s leg his steel scalpel touched against one of the frog’s nerves and the leg muscles jerked. The leg twitched. He called this Phenomenon as animal electricity. Copy the link given below and paste it in new browser window to get more information on Cells, EMF, Internal Resistance www.askiitians.com/iit-jee-electric-current/cells-emf-internal-resistance/
Alessandro Volta invented electric battery. It was first named as Voltaic Pile. For his contributions to science, the unit of electric potential is named as Volt. John Frederic Daniell developed Daniell cell. Copy the link given below and paste it in new browser window to get more information on Cells in Series and in Parallel www.askiitians.com/iit-jee-electric-current/cells-in-series-and-in-parallel/
As charges are of two types, positive and negative, there are other certain basic properties they follow. If the size of charged bodies is so small, we consider them as point charges. Copy the link given below and paste it in new browser window to get more information on Basic Properties of Electric Charge www.askiitians.com/iit-jee-electrostatics/basic-properties-of-electric-charge/
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2. Length
Length is a fundamental quantity which we use to
measure different size of objects
The standard unit of length is meter
We use units of length preference wise, so that
our measurements are precise and accurate
3. Measurement of Length
We use different units to measure different
lengths
For example, we make use of feet and inches to
measure our height
We use kilometer to measure the distance
travelled by our vehicle
4. Measurement of Large Distance
There are certain distance which can’t be
measured with the help of scales and instruments
To measure large distances we use two special
methods
Parallax method
Echo Method
5. Parallax method
In this method we use the parallax principal,
which means measuring the displacement
caused by two observation point of view relative
to each other
The arc length formula is used to measure large
distances in this method
6. Echo Method
This method involves the echo concept, which
depicts that sound comes back after reflection
We measure the distance travelled by sound in a
specific time interval to measure distance of a
certain building or a hill
Speed = 2 × Distance/ Time, is used to measure
the distance D in echo method
7. Range of Length
The range of measurement of length is quite wide
and varies from microscopic level to the
macroscopic one
For example size of atoms and molecules is 10-
14m
The size of universe is around 1026 m
8. Hey Friend,
This was just a summary on Measurement of Length.
For more detailed information on this topic, please type
the link given below or copy it from the description of this
PPT and open it in a new browser window.
www.askiitians.com/iit-jee-physics/general-physics/measurement-
of-length/