IB SL Physics Poorly Answered Questions 3
/The third sheet of SL Physics questions on areas that are not well answered is given below.
- In a longitudinal wave what are the ray directions and direction of the wavefront? What are these directions for a transverse wave?
- A string of length 40 cm is fixed at each end and set oscillating in its fundamental mode. What is the phase difference between two points on the string that are 25 cm part?
- A particle is moving in simple harmonic motion. Sketch a graph showing the momentum of the particle versus its speed.
- When two waves interfere constructively what is the ratio of the intensity produced by the two waves interfering constructively to the intensity due to one of the waves only?
- An ammeter and a voltmeter are connected in series with a cell of emf 12 V connected to a 2 Ω resistor. What is the reading on each meter?
- An electron is accelerated from rest between two electrodes a distance d apart and the final kinetic energy of the electron is X eV. If the electodes are now placed a distance 2d apart the final kinetic energy of the electron is (a) X/√2, (b) X/2 (c) X (d) 2X
- A mass is placed on the end of a light rod of length L and is made to revolve in a vertical plane at a constant speed. At what point in the path is the force exerted by the rod on the mass maximum?
- Two resistors P and Q are made of the same material and are at the same temperature. P has twice the length of Q and one half the diameter of Q. If the resistance of Q is 2 Ω, find the resistance of P and Q when they are connected in parallel.
