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Microwaves have frequencies in the range \(10^{9}\) to \(10^{12} / \mathrm{s}\) (cycles per second), equivalent to between 1 gigahertz and 1 terahertz. What is the wavelength of microwave radiation whose frequency is \(1.395 \times 10^{10} / \mathrm{s}\) ?

Short Answer

Expert verified
The wavelength is 0.0215 meters (or 2.15 cm).

Step by step solution

01

Identify Known Values

We know the frequency \( f \) of the microwave radiation is \( 1.395 \times 10^{10} \, \text{Hz} \). We also know the speed of light \( c = 3.00 \times 10^{8} \, \text{m/s} \).
02

Apply the Formula for Wavelength

The wavelength \( \lambda \) of electromagnetic radiation is determined using the equation \( c = \lambda f \). Rearrange this equation to solve for \( \lambda \), giving \( \lambda = \frac{c}{f} \).
03

Substitute Values into the Equation

Substitute the known values into the equation: \( \lambda = \frac{3.00 \times 10^{8} \, \text{m/s}}{1.395 \times 10^{10} \, \text{Hz}} \).
04

Calculate the Wavelength

Perform the division to find \( \lambda \): \( \lambda = 2.15 \times 10^{-2} \, \text{m} \). Therefore, the wavelength is 0.0215 meters.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Wavelength Calculation
To find the wavelength of any electromagnetic wave, including microwaves, you need to know the frequency of the wave and the speed at which it travels. For electromagnetic waves, this speed is the speed of light, approximately \(3.00 \times 10^{8} \, \text{m/s}\). Once you have these values, the calculation is straightforward using the formula:
  • \(c = \lambda f\)
Here, \( c \) is the speed of light, \( \lambda \) is the wavelength, and \( f \) is the frequency. To find the wavelength, you rearrange the formula to solve for \( \lambda \):
  • \(\lambda = \frac{c}{f}\)
After plugging in your known values, carry out the division to find \( \lambda \). Remember, the units of \(c\) are meters per second (m/s), and \(f\) should be in hertz (Hz), which is cycles per second. The resulting wavelength \( \lambda \) will be in meters.
Electromagnetic Spectrum
The electromagnetic spectrum is the range of all types of electromagnetic radiation. Radiation is the emission or transmission of energy in the form of waves or particles through space or a material medium. Within the spectrum, microwaves sit between radio waves and infrared radiation.
  • Radio waves have longer wavelengths and lower frequencies.
  • Infrared waves have shorter wavelengths and higher frequencies.
Microwaves typically have wavelengths that range from about 1 millimeter to 30 centimeters and frequencies ranging from 1 GHz to 300 GHz. This position in the spectrum makes them suitable for various applications, such as:
  • Wi-Fi communication
  • Microwave cooking
  • Radar technology
Understanding the electromagnetic spectrum helps in comprehending the properties and uses of different types of radiation.
Frequency to Wavelength Conversion
Converting frequency to wavelength is a common task in physics, especially when dealing with waves. Once you understand the relationship between frequency and wavelength, the conversion becomes simple.The core principle relies on the speed of light equation:
  • \(c = \lambda f\)
  • Where \(\lambda = \frac{c}{f}\)
When you want to find the wavelength given a known frequency:- Arrange the formula to \(\lambda = \frac{c}{f}\).- Substitute the frequency and speed of light into the equation.- Perform the division to solve for \(\lambda\).The key is to ensure the units are consistent:- The speed of light \(c\) is always \(3.00 \times 10^{8} \, \text{m/s}\).- Frequency \(f\) should be in hertz (Hz).This conversion is useful not only for theoretical studies but also in practical applications like understanding cellular technology, satellite communications, and radio broadcasting.

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Most popular questions from this chapter

Neutrons are used to obtain images of the hydrogen atoms in molecules. What energy must be imparted to each neutron in a neutron beam to obtain a wavelength of 10.0 pm? Obtain the energy in electron volts (eV) \(\left(1 \mathrm{eV}=1.602 \times 10^{-19} \mathrm{~J}\right)\)

Of the following possible transitions of an electron in a hydrogen atom, which emits light of the highest energy? a Transition from the \(n=1\) to the \(n=3\) level b Transition from the \(n=1\) to the \(n=2\) level c Transition from the \(n=3\) to the \(n=1\) level d Transition from the \(n=2\) to the \(n=1\) level e Transition from the \(n=5\) to the \(n=4\) level

The energy of a photon is \(3.05 \times 10^{-19} \mathrm{~J}\). What is the wavelength of the corresponding light? What is the color of this light?

The retina of the eye contains two types of lightsensitive cells: rods (responsible for night vision) and cones (responsible for color vision). Rod cells are about a hundred times more sensitive to light than cone cells and are able to detect a single photon. Suppose a group of rod cells are radiated with a pulse of light having an energy equal to \(1.60 \times 10^{-16} \mathrm{~J}\). If the wavelength of this light was \(498 \mathrm{nm}\) (the wavelength at which rod cells are most sensitive), how many photons are in this light pulse?

7.22 What wavelength of electromagnetic radiation corresponds to a frequency of \(3.46 \times 10^{13} \mathrm{~s}^{-1} a \) ? \(8.66 \times 10^{-6} \mathrm{~m}\) b \(1.15 \times 10^{5} \mathrm{~m}\) c \(7.65 \times 10^{-29} \mathrm{~m}\) d \(9.10 \times 10^{-6} \mathrm{~m}\) e \(8.99 \times 10^{-6} \mathrm{~m}\)

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