| 211. |
Energetic neutrons are easily absorbed by some nuclei because
they Answer
|
|
A. |
have a high kinetic energy. |
C. |
are readily accelerated. |
|
B. |
have a low atomic mass. |
D. |
are neutral. |
|
|
|
|
|
| 212. |
Which of the
following reactions is a nuclear fission? Answer
|
|
A. |
98Tc
--> 98Ru + 0e-1 |
C. |
2H + 2H
---> 4He |
|
B. |
n + 235U
--> 90Sr + 144Xe + 2n |
D. |
238U +
n ---> 239U |
|
|
|
|
|
| 213. |
It takes 45.0 hours
to transport sodium-24 from the nuclear reactor where it is made to the
lab that uses the isotope. What is the minimum amount that must be
sent from the nuclear reactor for the lab to receive 2.00 grams if
sodium-24 has a half-life of 15.0 hours? Answer
|
|
A. |
4.00 g |
C. |
16.00 g |
|
B. |
8.00 g |
D. |
32.00 g |
|
|
|
|
|
| 214. |
Which combination of
protons and neutrons is least likely to give a stable isotope? Answer
|
|
A. |
odd protons and odd neutrons |
C. |
even protons and odd neutrons |
|
B. |
odd protons and even neutrons |
D. |
even protons and even neutrons |
|
|
|
|
|
| 215. |
Thomson's Cathode
Ray Tube Experiment can correctly be interpreted as showing Answer
|
|
A. |
electrons orbit the nucleus |
C. |
electron has a negative charge |
|
B. |
electrons are in orbitals |
D. |
electron has a smaller mass than
the proton |
|
|
|
|
|
| 216. |
Which of the
following is not used to detect radiation? Answer
|
|
A. |
Effect on living organisms |
C. |
Photographic film |
|
B. |
Geiger counters |
D. |
Cyclotrons |
|
|
|
|
|
| 217. |
Which type of
radiation is the easiest to stop? Answer
|
|
A. |
energetic neutrons |
C. |
beta particles |
|
B. |
alpha particles |
D. |
gamma rays |
|
|
|
|
|
| 218. |
Conditions necessary
for an electron to absorb a photon include Answer
|
|
A. |
photon must hit the electron. |
C. |
There must be room in the new
orbital for the electron. |
|
B. |
The photon must have the exact
amount of energy necessary to move the electron into a new orbital. |
D. |
all of the above. |
|
|
|
|
|
| 219. |
Watches that glow in
the dark stop glowing after a couple of days in a dark closet
because Answer
|
|
A. |
all of the electrons
have returned to the ground state. |
|
B. |
the light hitting
the electrons is not of the correct color. |
|
C. |
all of the photons
were absorbed by a dark force. |
|
D. |
the battery has run
down. |
|
|
|
|
|
| 220. |
16.0 grams of
isotope X decay to form 2.00 grams of X after 10.0 days. What
is the half-life of isotope X? Answer
|
|
A. |
1.25 days |
C. |
5.00 days |
|
B. |
2.50 days |
D. |
10.0 days |
