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Chapter 7: Problem 96

What properties of electrons are used in the operation of an electron microscope?

Short Answer

Expert verified
The operation of an electron microscope takes advantage of the short wavelengths of electrons for greater resolution and the behaviour of electrons under magnetic fields for focusing the beam.

Step by step solution

01

The Wavelength of Electrons

In an electron microscope, short wavelengths of electrons are used. This is because the information that a wave can carry about an object is determined by its wavelength; shorter wavelengths can resolve smaller details. This principle also applies in microscopy, where using short-wavelength electrons instead of larger-wavelength light allows for much greater resolution.
02

Behaviour under Magnetic Fields

The other key property of electrons used in electron microscopy is their behaviour under magnetic fields. In an electron microscope, magnetic fields are used instead of glass lenses to focus the electron beam. Because electrons are charged particles, they will curve in a magnetic field. This property allows the microscope to focus the electrons onto a specific point, providing a magnified image of the subject.

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Most popular questions from this chapter

Define the following terms and give an example of each: transition metals, lanthanides, actinides.

Spectral lines of the Lyman and Balmer series do not overlap. Verify this statement by calculating the longest wavelength associated with the Lyman series and the shortest wavelength associated with the Balmer series (in \(\mathrm{nm}\) ).

The atomic number of an element is \(73 .\) Is this element diamagnetic or paramagnetic?

What are the group and period of the element osmium?

Indicate which of the following sets of quantum numbers in an atom are unacceptable and explain why: (a) \(\left(1,0, \frac{1}{2}, \frac{1}{2}\right)\) (b) \(\left(3,0,0,+\frac{1}{2}\right)\) (c) \(\left(2,2,1,+\frac{1}{2}\right)\) (d) \(\left(4,3,-2,+\frac{1}{2}\right)\), (e) \((3,2,1,1)\).
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