Respuesta :
The frequency of yellow light of wavelength 580 nm is [tex]\boxed{{0.05172\times10^{18}}\text{Hz}}[/tex]
Further Explanation:
Wavelength is the characteristic property of a wave. The term wavelength is defined as the distance between two successive crests or troughs in a wave. It is represented by [tex]\lambda[/tex] and its SI unit is meter (m).
The term frequency is defined as the number of times n event occurs in unit time. It is generally applied to waves including light, sound and radio waves. It is denoted by [tex]{\text{v }}[/tex] and its SI unit is Hertz (Hz).
The conversion factor to convert nm to m is,
[tex]1\;{\text{nm}}={10^{ - 9}}\;{\text{m}}[/tex]
The wavelength and frequency of light are related to each other by the following expression,
[tex]{\text{c}} = {v\lambda}[/tex] ......(1)
Here,
C is the speed of light.
[tex]v[/tex] is the frequency of light.
[tex]\lambda[/tex] is the wavelength of light.
Rearrange equation (1) to calculate the frequency of light.
[tex]v=\dfrac{c}{\lambda}[/tex] ......(2)
The wavelength of yellow light is 580 nm.
Firstly, wavelength of yellow light is to be converted from nm to m as follows:
[tex]\begin{aligned}{\text{Wavelength of yellow light }}\left({\text{m}}\right)&=\left( {{\text{580 nm}}}\right)\left({\frac{{{{10}^{ - 9}}\;{\text{m}}}}{{1\;{\text{nm}}}}}\right)\\&=58\times {10^{ - 10}}\;{\text{m}}\\\end{aligned}[/tex]
The speed of yellow light is [tex]3 \times {10^8}\;{\text{m/s}}[/tex].
The wavelength of yellow light is [tex]58\times {10^{ - 10}}\;{\text{m}}[/tex].
Substitute these values in equation (2)
[tex]\begin{aligned}{v }}&=\frac{{{\text{3}}\times{\text{1}}{{\text{0}}^8}\;{\text{m/s}}}}{{58 \times{{10}^{ - 10}}\;{\text{m}}}}\\&=0.05172\times{\text{1}}{{\text{0}}^{18}}\;{\text{Hz}}\\\end{aligned}[/tex]
So the frequency of yellow light is [tex]{\mathbf{0}}{\mathbf{.05172 \times 1}}{{\mathbf{0}}^{{\mathbf{18}}}}\;{\mathbf{Hz}}[/tex].
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Answer details:
Grade: Senior School
Subject: Chemistry
Chapter: Structure of the atom
Keywords: frequency, wavelength, yellow light, 580 nm, crests, troughs, speed of light, wavelength of light, frequency of light, conversion factor, Hz, m.
The frequency of this yellow light with wavelength, 580.0 nm is; 5.2 × 10¹⁴ Hz.
According to the question:
- The wavelength of the yellow light is 580.0 nm.
- By convention, the speed of light (photons), c = 3×10⁸ m/s.
We must also establish the relationship between the speed, wavelength and frequency as follows;
c = f × λ
Therefore, f = c/λ
where,
- c = speed of light
- f = frequency
- λ = wavelength.
However, 580nm = 580 × 10^-⁹ m = 5.8 × 10-⁷m
- Since, 1nm = 10^-9m
Consequently, the frequency, f of this yellow light is;
- f = 3×10⁸/5.8 × 10^-⁷
- f = 5.2 × 10¹⁴ Hz.
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