1. Physical methods: radiation

Question 1

what is used?

Answer 1

Microwaves, UV, X-rays, gamma

rays, and electrons

Question 2

UV has sufficient energy to

Answer 2

-cause modifications-break in DNA

Question 3

modification and break in DNA wich?

Answer 3

inhibit replication,transcription and causes death

Question 4

UV is useful for _________

of surfaces

Answer 4

decontamination

Question 5

Cannot penetrate ___, _____

or______surfaces

Answer 5

solid,opaque,light-absorbing surfaces

Question 6

Useful for disinfection of drinking

____ and ___, but only on the ____

Answer 6

water-air

-surface

Question 7

Ionizing radiation

Answer 7

Electromagnetic radiation that produces

ions and other reactive molecules

Question 8

Generates____and ______

that cause damage to ___and ____

Answer 8

• electron
• hydroxyl radicals
• DNA
• proteins

Question 9

Amount of energy required to reduce

viability of tenfold is ______to D value

Answer 9

analogous

Question 10

Sources of radiation include

Answer 10

cathode ray
tubes (electrons), X-rays, and
radioisotopes (emit gamma rays)

Question 11

Radiation is used for sterilization in the

______ and _________

Answer 11

• medical field

- food industry

Question 12

decimal reduction is ?

Answer 12

90% reduction