Intensity is the quantity of energy carried by a wave per unit time across a surface of unit area, and it is also equal to the energy density multiplied by the wavelength speed. It is usually measured in units of watts per square meter. The strength and amplitude of a wave will depend on the intensity. Intensity is denoted as I.

Formula

Formula for intensity is given by,

In symbols, that is, where

I stands for the intensity,
P for the power, and
A for the area of cross-section.

Solved Problems

Problem 1: Determine the intensity of a wave if its power is 25 KW, the area of cross-section is ?

Answer:

Known measures are,

Intensity formula is,

Problem 2: Determine the power of a wave whose intensity and area of the cross-section are respectively?

Answer:

Known quantities are,

Formula for intensity is,

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Intensity Formula

What is Intensity?

Formula

Formula for intensity is given by,

In symbols, that is, where

I stands for the intensity,
P for the power, and
A for the area of cross-section.

Solved Problems

Problem 1: Determine the intensity of a wave if its power is 25 KW, the area of cross-section is ?

Answer:

Known measures are,

Intensity formula is,

Problem 2: Determine the power of a wave whose intensity and area of the cross-section are respectively?

Answer:

Known quantities are,

Formula for intensity is,

Other Related Sections

List of Physics Formulas

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Frequently Asked Questions

Ptolemy’s Theorem

Formula: Ptolemy’s Theorem relates the sides and diagonals of a cyclic quadrilateral. For a cyclic quadrilateral ABCD with diagonals AC and BD, the theorem states:

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