IB IB Physics 2 — Questions and Answers
Question 1: What type of wave is sound classified as in IB Physics?
- Transverse
- Electromagnetic
- Longitudinal (Correct answer)
- Surface
Correct answer: Longitudinal
Sound is a longitudinal wave in which particle displacement is parallel to the direction of wave propagation, creating compressions and rarefactions.
Question 2: Which equation correctly relates frequency (f) and period (T)?
- f = T
- f = 1/T (Correct answer)
- f = T²
- f = 2πT
Correct answer: f = 1/T
Frequency and period are reciprocals: f = 1/T, meaning a wave with a 2-second period has a frequency of 0.5 Hz.
Question 3: What is the speed of light in a vacuum, as listed in the IB Physics data booklet?
- 3.0 × 10⁶ m/s
- 3.0 × 10⁸ m/s (Correct answer)
- 3.0 × 10¹⁰ m/s
- 3.0 × 10⁴ m/s
Correct answer: 3.0 × 10⁸ m/s
The speed of light in a vacuum is c = 3.0 × 10⁸ m/s, a fundamental constant used throughout IB Physics.
Question 4: What does Ohm's Law state about the relationship between voltage (V), current (I), and resistance (R)?
- V = I/R
- V = IR (Correct answer)
- V = I²R
- V = R/I
Correct answer: V = IR
Ohm's Law states V = IR, meaning the voltage across a conductor equals the current through it multiplied by its resistance.
Question 5: What is the SI unit of electrical resistance?
- Ampere
- Volt
- Ohm (Correct answer)
- Siemens
Correct answer: Ohm
The ohm (Ω) is the SI unit of electrical resistance, defined as the resistance when one volt produces one ampere of current.
Question 6: Which of Kirchhoff's laws states that the total current entering a junction equals the total current leaving it?
- Ohm's Law
- Kirchhoff's Voltage Law
- Faraday's Law
- Kirchhoff's Current Law (Correct answer)
Correct answer: Kirchhoff's Current Law
Kirchhoff's Current Law (KCL) states that the algebraic sum of currents at a junction is zero, reflecting conservation of charge.
Question 7: When light passes from air into glass, which wave property changes?
- Frequency
- Speed and wavelength (Correct answer)
- Frequency and speed
- Wavelength only
Correct answer: Speed and wavelength
When light enters a denser medium, its speed and wavelength both decrease while its frequency remains constant, causing refraction.
IB IB Physics 2
What type of wave is sound classified as in IB Physics?