IB Physics-Paper 1 - Theme C- Waves- and waves-Part#2

- L is a point source of light. The intensity of the light at a distance 2𝑥 from L is I. What is the intensity at a distance 3𝑥 from L?
- X and Y are two coherent sources of waves. The phase difference between X and Y is zero. The intensity at P due to X and Y separately is I. The wavelength of each wave is 0.20 m. What is the resultant intensity at P?
- A first-harmonic standing wave is formed on a vertical string of length 3.0 m using a vibration generator. The boundary conditions for this string are that it is fixed at one boundary and free at the other boundary. The generator vibrates at a frequency of 300 Hz. What is the speed of the wave on the string?
- Two travelling waves are moving through a medium. The diagram shows, for a point in the medium, the variation with time t of the displacement d of each of the waves. For the instant when t = 2.0 m/s, what is the phase difference between the waves and what is the resultant displacement of the waves?

- Two sound waves from a point source on the ground travel through the ground to a detector. The speed of one wave is 7.5 km s–1, the speed of the other wave is 5.0 km s–1. The waves arrive at the detector 15 s apart. What is the distance from the point source to the detector.
Topic 4 oscillation and waves playlist:

[businessman]

If I am not wrong, your question 26 is wrong.

The question doesnt ask for: λ1/λ3,

they ask for L1/L3.

So your answer should be 1/3. Am I mistaken here?

[jeyakumari]

Heyy linda, i want to ask if the question 28 is from hl or sl syllabus of ib physics??