What are two types of electron microscopes, and how do they work?

Answers

Answer 1

Answer: Scanning electron microscope (sem): an electron beam scans the surface of a specimen (coated with gold) that excites electron from the specimen which are detected and translated into an image that is three-dimensional. It is used to study the topography of a specimen

Transmission Electron microscope (TEM):a beam of electrons is passed through a thin section of specimen that is stained with atoms or heavy metals and electromagnets acts as lenses that focus the image onto a screen or film. It is used to study the internal structure of a specimen--cells

Related Questions

Why is the protist kingdom sometimes called the "odds and ends" kingdom?
Which law states that the volume of a gas is proportional to the moles of the gas when pressure and temperature are kept constant?
. As the elements in Period 3 are considered in order of increasing atomic number, there is a general decrease inatomic massatomic radiuselectronegativityfirst ionization energy
Which of the following is the correct electron configuration for titanium (Ti)?
A carbon-12 atom has a mass of 12.00000 amu. The mass of a proton is 1.00728 amu, and the mass of a neutron is 1.00866 amu. How many protons does the carbon-12 atom have? How many neutrons does the carbon-12 atom have? What is the mass defect of a carbon-12 atom? amu

The solid and liquid phases of water can exist ina state of equilibrium at 1 atmosphere of pressure
and a temperature of
(1) 0°C (3) 273°C
(2) 100°C (4) 373°C

Answers

Answer: 0°C

Explanation:
Water undergoes phase changes at 1 atm pressure as follows:
Solidification, change from water to ice occurs at 0°C.
Evaporation, change from liquid to gas occurs at 100°C.

Why should hypothesis be testable?

Answers

Answer:

D. It must be testable in order to be found true or false.

APEX

When a hypothesis is testable, it means that it's possible to see whether the prediction is true or not. Testing a hypothesis can include conducting experiments, collecting data and making observations.

A _________ shampoo is designed to re-balance the pH level of your hair by neutralizing any alkali and unwanted residues in the hair. Options: A) Clarifying B) Moisturizing C) Neutralizing D) Medicated

Answers

Answer:

C) Neutralizing

Explanation:

A neutralizing shampoo is specifically formulated to restore the pH balance of the hair by neutralizing any alkali or unwanted residues that may have accumulated. It is commonly used after chemical treatments such as perms or relaxers, which can alter the hair's pH level.

Chemical processes like perms and relaxers often involve the use of alkaline substances to break down and reshape the hair structure. After the process is complete, a neutralizing shampoo is used to stop the chemical reaction and bring the hair's pH back to its normal, balanced state. This helps to ensure the hair's health, smoothness, and manageability.

Which of the following observations led physicist James Chadwick to perform experiments that eventually led to the discovery of the neutron?A. Protons alone were not able to account for the density of an atoms nucleus.

B. Atomic nuclei possess shells similar to the electron shells of atoms.

C. Some atoms contained more protons than electrons.

Answers

The correct answer is letter C. James Chadwick confirmed the existence of neutrons.In his experiment, he was able to show that the particles that were ejected had no electrical charge but had almost the same mass as the proton. These particles were, of course, neutrons.

In the unit cell of galena, six square faces of equal size each form 90 degree angles with every adjacent face. What type of crystal system is this?tetragonal
hexagonal
triclinic
cubic

Answers

Answer : The correct option is, Cubic.

Explanation :

As there are seven types of crystal systems which are cubic, tetragonal, orthorhombic, monoclinic, triclinic, rhombohedral and hexagonal.

A unit cell is characterized by the axial length (a, b and c) and axial angle $(\alpha ,\beta ,\gamma )$ parameters which decide the size and shape of the unit cell.

In tetragonal crystal system, $a=b\neq c$ and $\alpha=\beta=\gamma=90^o$

In hexagonal crystal system, $a=b\neq c$ and $\alpha=\beta=90^o,\gamma=120^o$

In triclinic crystal system, $a\neq b\neq c$ and $\alpha\neq \beta\neq \gamma=90^o$

In cubic crystal system, $a=b=c$ and $\alpha=\beta=\gamma=90^o$

Hence, the correct option is, Cubic.

What is a glass rod used for in chemistry and biology laboratory?

Answers

The glass rod is a piece of laboratory equipment and it is used for the mixing of chemicals and other liquids.

Final answer:

A glass rod is used in chemistry and biology laboratories for transferring liquids, stirring solutions, and manipulating microscopic organisms.

Explanation:

A glass rod is commonly used in chemistry and biology laboratories for various purposes. In chemistry, it can be used to transfer small amounts of liquids from one container to another without contamination. It is also used for stirring solutions and facilitating chemical reactions. In biology, a glass rod can be used for extracting small samples or manipulating microscopic organisms in a controlled manner.

Learn more about Glass rod in laboratory here:

brainly.com/question/34172771

#SPJ11

Other Questions

In what ways is a sodium atom different from a sodium ion? *

Why is Neon in the same group of the periodic table as Helium?

Can someone please take a look at this lab.? And show answers with work? Thanks! I tried it but I'm pretty sure I did it all wrong.

Which is an example of a heterogeneous catalyst?amylase catalytic converter food preservatives amino acids