K: 14 I: /4 A: 14 C: 14 Question 1: A spaceship measures a length of 200.0 m moving at a speed of 0.89c, determine the length of the spaceship and the time by the observer on earth if it has been travelling for 90 days. (K:1, I:1, A:1, C:1) Question 2: An electron was accelerated through a particle accelerator by a voltage of 15.0 kV. Determine its de Broglie wavelength, the relativistic mass and momentum. (K:1, I:1, A:1, C:1) Question 3: Ultraviolet light with wavelength of 125 nm was used to create a photocurrent in a circuit. If the metal used has a work function of 3.45 eV, determine the velocity of the ejected electron. (K:1, I:1, A:1, C:1) Question 4: Same ultraviolet light with wavelength of 125 nm was used to excite an electron at ground level of a hydrogen atom, determine the final level the electron will end up with. (K:1, I:1, A:1, C:1)