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An electron beam can undergo diffraction by crystals. Through what potential should a beam of electrons be accelerated so that its wavelength becomes equal to 1.54 Angstrom? 1-63.2V 2-126.4V 3-31.6V 4-632V
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An electron beam can undergo diffraction by crystals. Through what pot...
Calculating Accelerating Potential for Electron Beam Diffraction
To determine the accelerating potential required for an electron beam to have a wavelength of 1.54 Angstroms, we can use the de Broglie wavelength equation:

λ = h / √(2mE)
where:
- λ is the wavelength (1.54 Angstroms)
- h is the Planck constant (6.626 x 10^-34 m^2 kg / s)
- m is the mass of an electron (9.11 x 10^-31 kg)
- E is the accelerating potential (in volts)
By rearranging the equation, we can solve for E:

E = h^2 / (2mλ^2)
After substituting the given values, we get:

E = (6.626 x 10^-34)^2 / (2 * 9.11 x 10^-31 * (1.54 x 10^-10)^2)

E ≈ 63.2 V
Therefore, the accelerating potential needed for the electron beam to have a wavelength of 1.54 Angstroms is approximately 63.2 volts.

Options:
1. 63.2V
2. 126.4V
3. 31.6V
4. 632V
The correct answer is 63.2V.
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An electron beam can undergo diffraction by crystals. Through what pot...
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Read the following text and answer the following questions on the basis of the same:Electron Microscope Electron microscopes use electrons to illuminate a sample. In Transmission Electron Microscopy (TEM), electrons pass through the sample and illuminate film or a digital camera.Resolution in microscopy is limited to about half of the wavelength of the illumination source used to image the sample. Using visible light the best resolution that can be achieved by microscopes is about ~200 nm. Louis de Broglie showed that every particle or matter propagates like a wave. The wavelength of propagating electrons at a given accelerating voltage can be determined byThus, the wavelength of electrons is calculated to be 3.88 pm when the microscope is operated at 100 keV, 2. 74 pm at 200 keV and 2.24 pm at 300 keV. However, because the velocities of electrons in an electron microscope reach about 70% the speed of light with an accelerating voltage of 200 keV, there are relativistic effects on these electrons. Due to this effect, the wavelength at 100 keV, 200 keV and 300 keV in electron microscopes is 3.70 pm, 2.51 pm and 1.96 pm, respectively.Anyhow, the wavelength of electrons is much smaller than that of photons (2.5 pm at 200 keV). Thus if electron wave is used to illuminate the sample, the resolution of an electron microscope theoretically becomes unlimited. Practically, the resolution is limited to ~0.1 nm due to the objective lens system in electron microscopes. Thus, electron microscopy can resolve subcellular structures that could not be visualized using standard fluorescence microscopy.Q. Wavelength of electron as wave at accelerating voltage 200 keV is

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An electron beam can undergo diffraction by crystals. Through what potential should a beam of electrons be accelerated so that its wavelength becomes equal to 1.54 Angstrom? 1-63.2V 2-126.4V 3-31.6V 4-632V
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