IB Physics Interference

A tutorial sheet of some interference concepts in SL and HL is given below.

1. Laser light is directed on two slits of width b and separation d. The interference pattern is observed on a screen at a distance D from the slits. How does the intensity pattern on the screen change when one of the slits is covered?
2. A telescope can just resolve each star in a double star system when the observation is made in yellow light. In which light will the star images be not resolved, red light or blue light?
3. Two synchronous sources are 0.50 m apart. Each source produces sound waves of wavelength 2.0 m. A microphone is initially at a distance of 10.0 m from each source. The intensity reading on the microphone is I. Draw a graph showing the intensity reading on the microphone as it is moved towards the sorrces on the bisector of the line joining the sources.

IB Physics Electric current

A tutorial sheet of questions on electric current is given below.

1. State the definition of electric current.
2. The ampere is a fundamental unit. What does a current of 1 A mean?
3. Every second 100 electrons pass a point moving to the left. What is the current?
4. Every minute 1000 electrons pass a point moving to the right. In the same time interval 1000 protons pass this point moving at the same rate to the right. The charges do not interact. a) What is the current at this point? b) What net charge passes this point in this time interval?