,NST2601 Assignment 3 (COMPLETE
ANSWERS) 2025 - DUE 26 July 2025
QUESTION 1 [30 MARKS]
1.1 Define the following: (20)
a. Particle
b. Atomic model
c. Subatomic
d. Protons
e. Neutrons
f. Electron configuration
g. Energy
h. Energy system
i. Electrical system
j. Thermal energy
1.2 Explain the main source of energy. (10)
QUESTION 2 [40 MARKS]
2.1 Differentiate between renewable and non-renewable
resources. (10)
2.2 Demonstrate Fleming’s left-hand rule. (10)
2.3 Discuss:
a. Electromagnetic radiation (10)
b. Thermal energy radiation (10)
QUESTION 1 [30 MARKS]
1.1 Define the following: (20 marks)
, a. Particle:
A particle is the smallest unit of matter that retains the
properties of a substance. In physical science, particles include
atoms, molecules, ions, and subatomic particles such as
protons, neutrons, and electrons. These particles can be
discrete or part of a larger system, and they are fundamental
in understanding the structure of matter and energy
interactions.
b. Atomic model:
An atomic model is a scientific theory that describes the
structure and behavior of atoms. Over time, different models
have been proposed:
Dalton’s model (1803) saw atoms as solid spheres.
Thomson’s model (1897) introduced the "plum pudding"
model with electrons.
Rutherford’s model (1911) proposed a dense nucleus with
electrons orbiting.
Bohr’s model (1913) introduced quantized orbits for
electrons.
Quantum mechanical model (modern) treats electrons as
existing in probability clouds called orbitals.
These models help explain atomic behavior, bonding, and
energy levels.
ANSWERS) 2025 - DUE 26 July 2025
QUESTION 1 [30 MARKS]
1.1 Define the following: (20)
a. Particle
b. Atomic model
c. Subatomic
d. Protons
e. Neutrons
f. Electron configuration
g. Energy
h. Energy system
i. Electrical system
j. Thermal energy
1.2 Explain the main source of energy. (10)
QUESTION 2 [40 MARKS]
2.1 Differentiate between renewable and non-renewable
resources. (10)
2.2 Demonstrate Fleming’s left-hand rule. (10)
2.3 Discuss:
a. Electromagnetic radiation (10)
b. Thermal energy radiation (10)
QUESTION 1 [30 MARKS]
1.1 Define the following: (20 marks)
, a. Particle:
A particle is the smallest unit of matter that retains the
properties of a substance. In physical science, particles include
atoms, molecules, ions, and subatomic particles such as
protons, neutrons, and electrons. These particles can be
discrete or part of a larger system, and they are fundamental
in understanding the structure of matter and energy
interactions.
b. Atomic model:
An atomic model is a scientific theory that describes the
structure and behavior of atoms. Over time, different models
have been proposed:
Dalton’s model (1803) saw atoms as solid spheres.
Thomson’s model (1897) introduced the "plum pudding"
model with electrons.
Rutherford’s model (1911) proposed a dense nucleus with
electrons orbiting.
Bohr’s model (1913) introduced quantized orbits for
electrons.
Quantum mechanical model (modern) treats electrons as
existing in probability clouds called orbitals.
These models help explain atomic behavior, bonding, and
energy levels.
