lesson 2

Question 1

a phenomenon that occurs when an unstable atom has too much energy and it has to be released in the form of waves

Answer 1

radioactivity

Question 2

who discovered xray

Answer 2

wilhelm conrad roentgen

Question 3

discovered xray produced by uranium

Answer 3

antoine henri becquerel

Question 4

discovered the thorium that gives off uranium rays

Answer 4

marie and pierre curie

Question 5

when was the xray of the hand of wilhelm conrad roentgen wife takes

Answer 5

december 22, 1895

Question 6

time required for a radioactive substance to reduce 50% of its active decay

Answer 6

radioactive half life

Question 7

time required for the body to eliminate one-half of an administered dosage of any substance by regular process of elimination

Answer 7

biologic half-life

Question 8

time required for a radioactive element in a body to be administered 50% as a result of the combination of radioactive decay and biological elimination

Answer 8

effective half life

Question 9

different sa taas

Answer 9

isotopes

Question 10

different sa baba

Answer 10

isobars

Question 11

minus atomic mass and atomic number

Answer 11

isotones

Question 12

same lahat

Answer 12

isomers

Question 13

radioactive decay by alpha

Answer 13

• loses 2 units of positive charge (p or z)
• loses 4 units of atomic mass no.
• emits alpha particle (a) and gamma-ray (y)

Question 14

radioactive decay of beta minus

Answer 14

• neutron is converted to proton
• increased atomic no. by 1 unit
• atomic mass no. remains the same
• emits negatron (b- particles) and gamma ray(y)

Question 15

radioactive decay by beta plus (B+)

Answer 15

-proton is converted to neutron
-proton in the parent nucleus decays into neutron that remains the daughter nucleus
-increase of neutron by 1 unit
-emit positron, neutron and gamma ray

Question 16

radioactivity decay by gamma ray

Answer 16

• emission of gamma rays by unstable nuclide
• no charge in atomic no.
• emits pure gamma ray

Question 17

radioactivity decay by electron capture

Answer 17

• nucleus of an atoms is absorbed one of its orbital electron
• electron converted into a neutron
• nucleus transforms to a daughter of one lower atomic number

Question 18

It is the spontaneous emission of particles and
energy when an unstable nuclide transforms into
a stable nuclide.

Answer 18

RADIOACTIVE DECAY/
RADIOACTIVE DISINTEGRATION

Question 19

It is the time required for a radioactive substance
to reduce 50% of its activity decay.

Answer 19

RADIOACTIVE HALF-LIFE/PHYSICAL
HALF-LIFE(T1/2p)

Question 20

It is the time required for the body to eliminate
one-half of an administered dosage of any
substance by regular process of elimination.

Answer 20

BIOLOGIC HALF-LIFE(T1/2b)

Question 21

It is the time required for a radioactive element
in a body to be administered 50% as a result of
the combined action of radioactive decay and
biologic elimination.

Answer 21

EFFECTIVE HALF-LIFE(T1/2eff)