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Dimensions of Wavelength

Dimensions of Wavelength

The Wavelength is defined as the Distance between successive crests, specifically between the points of an electromagnetic wave. Wavelength is inversely proportional to frequency. If the frequency increases, the wavelength decreases and vice versa. Wavelength is symbolised by formula . The dimensions of wavelength aid in deriving the formulas and measurement of the wavelengths of electromagnetic waves.

Wavelength

Image: Wavelength

Table of Contents:

Formula of Wavelength

The formula of wavelength can be written as

formula

Where formula  is the wavelength

v denotes the velocity of the wave in metres per second, and

f represents the frequency in hertz (Hz). 

Dimensional Formula of Wavelength

The formula for the dimensions of wavelength can be expressed as

formula

Where M represents the Mass,

L denotes the Length, and

T is the Time.

Derivation of Wavelength

The formula for the dimensions of wavelength can be derived by the following steps below:

Wavelength = Distance between identical points in the adjacent cycles of a waveform. We know the dimensional formula of Distance formula

Therefore, the derived formula for the dimensions of wavelength is formula

Benefits of the Dimensional Formula of Wavelength

There are numerous benefits of using the dimensional formula of wavelength. Some of them are as follows:

  • Assisting in deriving new formulas or equations using distinct physical quantities, including wavelength.
  • Aids in determining the correctness and consistency of the wavelength equation.
  • Helps express the relationships between two or more variables involved in the system.
  • Determines the errors in the homogeneous equations.
  • Aids in the transformation of the units of one system to another.

Limitations of the Dimensional Formula of Wavelength

Despite several benefits, certain restrictions exist to using the dimensional formula of Wavelength. They include the following:

  • Unable to perform tasks for nonlinear equations.
  • Strictly limited to the homogeneous equations
  • Does not define if the physical quantity is vector or scalar.
  • Do not provide accurate numerical values of the physical quantities.
  • It cannot function for dimensionless constants and ratios.

Practice Problems

Q1. The SI unit of wavelength is

a. Metre
b. Ampere
c. Coulomb
d. Hectare

Ans: a. Metre

The wavelength can be measured in metres, denoted by m (SI unit).

Q2. Choose the correct formula for the dimensions of wavelength.

formula

Q3. The wavelength formula can be illustrated as

formula

Q4. Wavelength is

A. Scalar quantity
B. Vector quantity
C. Either a or b
D. None of the above

Ans. Scalar quantity

Frequently Asked Questions

Q1. Can Wavelength be affected by the change in the medium?
Answer:
Yes. On passing from one medium to another, wavelengths are influenced due to the phenomenon of wave refraction and dispersion. 

Q2. State the domains in which Wavelength can be applicable.
Answer: 
Wavelength is beneficial in certain domains like hospitals and research. It includes an X-ray, MRI, and CT Scan, also in household appliances like microwaves.

Q3. What is the difference between wavelength and frequency?
Answer: 
The wavelength of a wave is the distance between two successive places on the wave, whereas the frequency is the number of complete cycles of the wave that occur per unit of time. They have a mathematical relationship. They are inversely connected and indicate various facets of a wave's characteristics.

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