1. What experiment is used to find the Resultant of 2 vectors? 2. Which wave phenomenon is used to distinguish between transverse waves and longitudinal waves? 3. Give the equation that defines temperature on the celsius scale. 4. What is the shortest wavelength of sound that can be haeard in air by a person given that the freq response of the ear ranges from 20Hz to 20kHz? 5. A tin whistle which acts like an open pipe has a fundemental freq of 256Hz. What is the freq of the second harmonic? 6. The following reaction represents pair production : gamma ray = positron + electron, calculate the min freq of the gamma ray photon required for this reaction to occur. There is one other question i was thinking of, Photons have no mass, but when light is shone on a crookes radiometer the vanes rotate? Is this because of the energy that photons have, E=hf (Energy = plancks constant multiplied by the freq).