physc/chm methods (3)

Question 1

What are two types of radiation

Answer 1

• nonionizing radiation
• ionizing radiation

Question 2

what type radiation is Ultraviolet light (UVL)

Answer 2

Nonionizing

Question 3

What is the most effective wavelength for ultraviolet light

Answer 3

~ 260 nm

Question 4

what is the effect of UVL?

Answer 4

Thymine dimers

Question 5

What has greater penetrance then UV Rays?

Answer 5

Ionizing rays

Question 6

two types of ionizing radiation used for sterilization purposes

Answer 6

Electronic beams
Electromagnetic rays

Question 7

are particulate in nature. A linear accelerator from a heated cathode is used to generate high speed electrons

Answer 7

Electronic beams

Question 8

are produced from nuclear disintegration of selected radioactive isotopes. They have greater penetrance than electron beams but require longer exposure time.

Answer 8

Electromagnetic rays

Question 9

Some bacteria can be killed after exposure to certain _____________

Answer 9

frequency of sound waves

Question 10

Exposure to sound waves at a frequency of approximately __________ for one
hour can kill some bacteria and viruses.

Answer 10

20,000 cycles/second

Question 11

Factors that can affect the efficacy of a chemical agent

Answer 11

1. Concentration and potency of the chemical agent
2. Duration of exposure
3. Temperature
4. Nature of the surrounding medium
5. Nature of the organism
6. Number of organisms/Size of inoculum