1. What is the symbol commonly used for the atomic mass unit?
A.
amu
B.
amp
C.
atm
D.
A
Correct Answer:
amu
Explanation:
The atomic mass unit is commonly represented by the symbol amu.
2. One atomic mass unit is defined as what fraction of the mass of a carbon-12 atom?
A.
1/2
B.
1/6
C.
1/12
D.
1/24
Correct Answer:
1/12
Explanation:
One atomic mass unit is defined as one-twelfth of the mass of a neutral carbon-12 atom.
3. The approximate value of 1 atomic mass unit in kilograms is:
A.
1.66 × 10^-27 kg
B.
1.66 × 10^-24 kg
C.
9.11 × 10^-31 kg
D.
1.60 × 10^-19 kg
Correct Answer:
1.66 × 10^-27 kg
Explanation:
The atomic mass unit has a mass of approximately 1.66 × 10^-27 kilograms.
4. Which particle's mass is commonly expressed in atomic mass units?
A.
Atom
B.
Light ray
C.
Electric current
D.
Temperature
Correct Answer:
Atom
Explanation:
Atomic mass units are used to express the masses of atoms and other microscopic particles.
5. The atomic mass unit is based on the mass of which isotope?
A.
Hydrogen-1
B.
Carbon-12
C.
Oxygen-16
D.
Uranium-238
Correct Answer:
Carbon-12
Explanation:
The atomic mass unit is defined using one-twelfth of the mass of a carbon-12 atom.
6. A particle with a mass of 2 u has a mass approximately equal to:
A.
3.32 × 10^-27 kg
B.
1.66 × 10^-27 kg
C.
8.30 × 10^-28 kg
D.
3.32 × 10^-24 kg
Correct Answer:
3.32 × 10^-27 kg
Explanation:
Using 1 u ≈ 1.66 × 10^-27 kg, 2 u ≈ 3.32 × 10^-27 kg.
7. Which of the following is another accepted symbol for the atomic mass unit?
A.
u
B.
W
C.
N
D.
J
Correct Answer:
u
Explanation:
The atomic mass unit is also represented by the symbol u, called the unified atomic mass unit.
8. The mass of a carbon-12 atom in atomic mass units is defined as:
A.
6 u
B.
12 u
C.
24 u
D.
1 u
Correct Answer:
12 u
Explanation:
Since 1 u is one-twelfth of the mass of carbon-12, a carbon-12 atom has a mass of exactly 12 u.
9. An atomic mass of 4 u corresponds approximately to what mass in kilograms?
A.
6.64 × 10^-27 kg
B.
4.00 × 10^-27 kg
C.
1.66 × 10^-28 kg
D.
6.64 × 10^-24 kg
Correct Answer:
6.64 × 10^-27 kg
Explanation:
Multiplying 4 by 1.66 × 10^-27 kg per atomic mass unit gives 6.64 × 10^-27 kg.
10. Why is the atomic mass unit useful in atomic physics?
A.
It conveniently expresses very small atomic masses
B.
It measures the temperature of atoms
C.
It measures the speed of light
D.
It measures electric charge only
Correct Answer:
It conveniently expresses very small atomic masses
Explanation:
Atomic masses are extremely small in kilograms, so the atomic mass unit provides a convenient unit for expressing them.
Short questions are currently unavailable for this page.