IB Physics SL C 2 5 Mechanical and Electromagnetic Wave Models Questions

Practise IB Physics SL C.2.5 by using c = fλ, calculating signal travel time and explaining the universal speed of light in vacuum.

Syllabus
First assessment 2025
Course
Physics SL
Level
SL

Exam points

  • Use c = fλ to connect electromagnetic-wave speed, wavelength and frequency.
  • Calculate signal travel time or distance using the universal vacuum speed c.
  • Explain Maxwell’s prediction that electromagnetic waves travel at one invariant vacuum speed.

IB Physics SL C 2 5 Mechanical and Electromagnetic Wave Models Questions question 1

[Maximum number: 1]

A rocket moving with speed v relative to the ground emits a flash of light in the backward direction.

Figure for Question IB Physics SL C 2 5 Mechanical and Electromagnetic Wave Models Questions question 1 — IB Physics SL

An observer in the rocket measures the speed of the flash of light to be c.
State the speed of the flash of light according to an observer on the ground using

Maxwell's theory of electromagnetism.

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