Question

question 4 (4 points)
(02.02 mc)
which type of microscope requires a nonmetal sample to be prepared for viewing by coating it with a thin layer of a conductive material?
a compound light microscope
b scanning electron microscope
c transmission electron microscope
d dissecting microscope

question 5 (4 points)
(02.02 mc)
which of the following describes an advantage of using a light microscope instead of an electron microscope?
a light microscopes provide much better resolution than electron microscopes, resulting in a clearer image.
b light microscopes can be used to observe live specimens, but preparing a specimen for electron microscopy would kill it.
c light microscopes have much higher magnification power than electron microscopes, as long as a high - resolution image is not needed.
d light microscopes can be used to observe any type of object, but using an electron microscope to look at metallic objects would damage the microscope.

question 6 (4 points)
(02.02 mc)
which of the following best explains how a scanning electron microscope is used to produce an image of a specimen?
a an electron beam strikes the specimen, is absorbed by the specimen, and is used to produce an electrically charged image on a screen.
b an electron beam passes over the specimens surface and displaces electrons, which are then focused on a screen to form an image.
c an electron beam traces an outline of the specimen onto a screen, and reflected electrons are collected to form the rest of the image.
d an electron beam travels through the specimen, and as it does so it burns an image of the specimen on a screen.

Explanation:

For Question 4, scanning electron microscopes require non - metal samples to be coated with a thin layer of conductive material to allow electrons to flow and create an image. For Question 5, a key advantage of light microscopes is that they can observe live specimens as electron microscopy sample preparation methods are generally lethal to the specimens. For Question 6, in a scanning electron microscope, an electron beam passes over the specimen's surface and displaces electrons which are then focused on a screen to form an image.

Answer:

Question 4: B. Scanning electron microscope
Question 5: B. Light microscopes can be used to observe live specimens, but preparing a specimen for electron microscopy would kill it.
Question 6: B. An electron beam passes over the specimen's surface and displaces electrons, which are then focused on a screen to form an image.