An electron beam strikes a specimen in an area where there is a high concentration of heavy metal atoms. What does a spot on the phosphorescent screen of the electron microscope just below this part of the specimen look like if compared to the area of the specimen where there is the high concentration of heavy metal atoms?
A)It is darker.
B)It is brighter.
C)It is speckled.
D)It is invisible.
E)It is purple.

Question

Quizplus · Accepted Answer

The heavy metal atoms in the specimen will scatter the electrons from the electron beam, causing them to scatter and produce bright spots on the phosphorescent screen. Therefore, the spot just below the high concentration of heavy metal atoms will be brighter compared to the surrounding areas.

An Electron Beam Strikes a Specimen in an Area Where