CD laser Wavelength question

In summary, the wavelength of a CD laser is approximately 780 nanometers (nm) and is important because it determines the resolution and accuracy of data read from a CD. It is measured using a spectrometer or a diffraction grating and cannot be changed by the user. The wavelength of a CD laser differs from other types of lasers as it is specific to its purpose of reading data from a CD.
  • #1
jsmith613
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Homework Statement



A CD stores data in digital form by encoding it into a grooves as a series of bumps of height 160 nm above the base of the groove. Explain how infromation is picked up from the CD using a laser and calculate its wavelength.

Can someone please explain how to do this question

Homework Equations



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The Attempt at a Solution



I don't understand the question at all! Sorry!
 
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  • #2
If possible could someone also add a diagram to help me
 

1. What is the wavelength of a CD laser?

The wavelength of a CD laser is approximately 780 nanometers (nm).

2. Why is the wavelength of a CD laser important?

The wavelength of a CD laser is important because it determines the resolution and accuracy of data read from a CD. Different wavelengths can affect the quality of the audio or data being read.

3. How is the wavelength of a CD laser measured?

The wavelength of a CD laser is measured using a spectrometer or a diffraction grating. These tools measure the distance between two adjacent peaks of the laser's wave pattern.

4. Can the wavelength of a CD laser be changed?

No, the wavelength of a CD laser is determined by the materials and design of the laser itself. It cannot be changed by the user.

5. How does the wavelength of a CD laser differ from other types of lasers?

The wavelength of a CD laser is specific to its purpose of reading data from a CD. Other types of lasers may have different wavelengths depending on their intended use, such as medical or industrial applications.

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