1. A train approaches and passes through a station. During this period the velocity of the train is constant and the engine is coninuously sounding its whistle. Which one of the following correctly describes what an observer on the platform will hear?
Sound heard as train is approaching station passing through station will be:
A. constant frequency increasing frequency
2. What is an extended source?
3. What equipment or methods can be used to detect the ultraviolet rays?
4. Why is there a large pause between the question and answer in television interviews to foreign correspondents?
5. Where can I find information about the different types of radars and their theory?
Two identical sources dipping in phase into water in a ripple tank generate the wave pattern shown in the diagram (click here to see the diagram).
State two properties of the light source to produce an observable interference pattern for two overlapping beams of light.
B. increasing frequency decreasing frequency
C. decreasing frequency increasing frequency
D. constant frequency decreasing frequency
Why is an extended source necessary for observing colour on thin films?
Along which of the labelled lines is the difference in path length from the two sources equal to two wavelengths?
A A B B C C D D
Explain what is meant by path difference when considering the interference of waves from two sources and its relevance in deducing the positions of maxima and minima of light intensity. (5 marks)
