```Characteristics of Wave
SOME IMPORTANT CHARACTERISTICS OF A WAVE
A wave is a sort of disturbance which originates from some vibrating source and travels outward as a continuous sequence of alternating crests and troughs. Every wave has five important characteristics, namely, wavelength (λ), frequency (v), velocity (c), wave number(v ¯ )  and amplitude (a).

Ordinary light rays, X–rays,λ–rays, etc. are called electromagnetic radiations because similar waves can be produced by moving a charged body in a magnetic field or a magnet in an electric field. These radiations have wave characteristics and do not require any medium for their propagation.

Wavelength (λ): The distance between two neighbouring troughs or crests is known as wavelength. It is denoted by l and is expressed in cm, m, nanometers (1 nm =10–9 m) or Angstrom (1 Å=10–10 m).

Frequency (v): The frequency of a wave is the number of times a wave passes through a given point in a medium in one second. It is denoted by n(nu) and is expressed in cycles per second (cps) or hertz (Hz) 1Hz = 1cps.

The frequency of a wave is inversely proportional to its wave length (λ)

v ∝ 1 / λ  or v = c / λ

Velocity: The distance travelled by the wave in one second is called its velocity. It is denoted by c and is expressed in cm sec–1.

c = vλ or λ = c / v

Wave number ( v- ): It is defined as number of wavelengths per cm. It is denoted by v- and is expressed in cm–1.

v- = 1 / λ or v- = v / c

Amplitude: It is the height of the crest or depth of the trough of a wave and is denoted by a. It determines the intensity or brightness of the beam of light.

Electromagnetic Spectrum: The arrangement of the various types of electromagnetic radiation in order of increasing or decreasing wavelengths or frequencies is known as electromagnetic spectrum.
```
Related Resources
Problems with Solutions

Problems with Solutions True and False Problem:...

Calculation of velocity of Electron

Calculation of Velocity: We know that mvr =...

Quantum Numbers

QUANTUM NUMBERS An atom contains large number of...

Atomic Models

Atomic Models We know the fundamental particles of...

Quantum Mechanical Model of Atom

Quantum Mechanical Model of Atom...

Discovery of Electron Proton and Neutron

Discovery of Electron, Proton & Neutron Lets...

Fundamental Particles

Relation-Kinetic Energy and Wavelength

Relation between Kinetic Energy and Wavelength:...

Atomic Spectrum

ATOMIC SPECTRUM If the atom gains energy the...

Discovery of Proton

DISCOVERY OF PROTON: POSITIVE RAYS OR CANAL RAYS...

Atomic Structure Terms

ATOMIC TERM Nuclide: Various species of atoms in...

Hunds rule of Maximum Multiplicity

Hund’s Rule of Maximum Multiplicity: This...

Solved Questions of Atomic Structure Part I

Solved Questions of Atomic Structure Part I...

Radius and Energy Levels of Hydrogen Atom

Radius and Energy Levels of Hydrogen Atom:...

Dual Nature of matter and Photoelectric Effect

Dual Nature of Matter and Photoelectric Effcet...

A-Scattering Experiment

A-Scattering Experiment Conclusions of...

Heisenbergs Uncertainty Principle

HEISENBERG’S UNCERTAINTY PRINCIPLE All...

Bohrs Atomic Model

BOHR’S ATOMIC MODEL Bohr developed a model...

Calculation of Energy of Electron

Calculation of Energy of an Electron: The total...

Hydrogen Atom

HYDROGEN ATOM If an electric discharge is passed...

Objective Questions of Atomic Structure

Objective Questions of Atomic Structure Problem:...

Derivation of Angular Momentum from de Broglie Equation

Derivation of Angular Momentum from de Broglie...

Plancks Quantum Theory

PLANCK’S QUANTUM THEORY When a black body is...

Electronic Configuration

Electronic Configuration Rules for filling of...

Discovery of Neutron

DISCOVERY OF NEUTRON After the discovery of...

Shapes and Size of Orbitals

Pauli’s Exclusion Principle: According to...

Limitations of Bohrs Theory

Merits of Bohr’s Theory: * The experimental...

Photoelectric Effect

PHOTOELECTRIC EFFECT Sir J.J. Thomson, observed...