2023-09-25 12:51:02
Physics 3 (Practical) (Alternative C)
Solution to Q2 & Q3
Ditto ditto
2nd Set enjoy , paper will start at 11:40 am —-Share To Inform Others—-
QUESTION 2b
2. (b) (i) Dispersion of light refers to the phenomenon where white light, composed of a mixture of different colors, is separated into its component colors when passing through a medium such as a prism or a drop of water. This separation occurs because different colors of light have different wavelengths and therefore different refractive indices, causing them to bend or refract at different angles.
2. (b) (ii) If the refractive index of medium P is twice that of medium Q, the angle of refraction can be calculated using Snell's law:
n₁sin(θ₁) = n₂sin(θ₂)
Given:
n₁ = refractive index of medium P
n₂ = refractive index of medium Q
θ₁ = angle of incidence
θ₂ = angle of refraction
Since n₁ = 2n₂,
2n₂sin(θ₁) = n₂sin(θ₂)
By simplifying the equation, we find:
2sin(θ₁) = sin(θ₂)
To solve for the angle of refraction, you would need the value of the angle of incidence (θ₁).
QUESTION 3b 3. (b) (i) The distinction between emf (electromotive force) and potential difference:
- Emf (electromotive force) is the energy supplied by a source, such as a battery or a generator, per unit charge in an electric circuit. It is measured in volts (V) and represents the maximum potential difference across a source when no current is flowing.
- Potential difference, also known as voltage, is the difference in electric potential energy per unit charge between two points in a circuit. It is measured in volts (V) and represents the actual voltage drop across a component or a part of a circuit when current is flowing.
3. (b) (ii) Two electronic devices that do not obey Ohm's law are:
- Diodes: Diodes are electronic components that allow electric current to flow in one direction only. The voltage-current relationship in a diode is nonlinear and does not follow Ohm's law.
- Transistors: Transistors are semiconductor devices that amplify or switch electronic signals. The relationship between voltage and current in transistors is highly complex and not linear, hence not following Ohm's law.
3. (b) (iii) Two electrical devices that do not obey Ohm's law are:
- Incandescent light bulbs: The resistance of incandescent light bulbs changes with variations in temperature, causing their current-voltage relationship to deviate from Ohm's law.
- Electric arcs (e.g., in electric welding): Electric arcs involve highly ionized gas and the current-voltage relationship in an arc is highly nonlinear, not following Ohm's law.
@Wasscefinallist
7.2K views09:51
W
