UNIVERSITY OF RIZAL SYSTEM Morong, Rizal COLLEGE OF EDUCATION MODERN PHYSICS PRE-TEST Name:______________________________________ Date:__________________ Yr. and Section:_______________________________ Score:_________________ Directions: Encircle the letter of the correct answer. 1. It is the amount of time separating two events that occurs at the time of location. a. Proper time b. Time dilation c. Biological aging d. Space travel 2. The distance between two points as measured by an object server who is at rest with respect to them. a. Proper length b. Contracted length c. Direction of contraction d. Relativistic length 3. The length that contract only in the direction of motion. a. Proper length b. Contracted length c. Direction of contraction d. Relativistic length 4. It occurs when photons of light eject electrons from the surface of a metal. a. Energy of Photons b. Work Function c. Photoelectric Effect d. Cutoff Frequency 5. The energy of a photons depends on the ___________. a. Frequency b. Amplitude c. Wavelength d. Wave speed 6. Are nuclie with the same number of atomic number but different atomic mass. a. Isotopes b. Gamma c. Beta d. Alpha 7. It is used to date organic materials with ages up to about 15,000 yrs. a. Carbon dating b. Uranium dating c. Plutonium Dating d. Barrion dating 8. The time it takes for a radioactive element to decrease into half. a. Half life b. Half time c. Half speed d. Half velocity 9. Elementary particles that experience the weak nuclear force but not the strong nuclear force. a. Leptons b. Electron c. Hadron d. Quarks 10. Elementary particles that experience the weak and strong nuclear force. a. Leptons b. Electron c. Hadron d. Quarks 11. Elementary particles that combine to form hadrons. a. Leptons b. Electron c. Hadron d. Quarks 12. Nuclei are compose of of just two types of particle:_____________ and ________. a. Protons and neutrons b. Electron and protons c. Neutron and electron d. Nucleus and protons 13. Particle that composed of two protons and neutrons a. Isotopes b. Gamma c. Beta d. Alpha 14. It refers to the emission of electrons. a. Isotopes b. Gamma c. Beta d. Alpha 15. It only occurs when an excited nucleus drops to a lower energy state. a. Isotopes b. Gamma c. Beta d. Alpha 16. It is the energy that use be supplied to separate it into its component’s nucleons. a. Binding energy b. Nuclear Fission c. Nuclear Fusion d. Chain reaction 17. Mass of the electron a. 9.11x10-11 Kg b. 9.11x10-12 Kg c. 9.11x10-13 Kg d. 9.11x10-14 Kg 18. Particles that which contains a mass slighty greater than that of the proton bu carries no electrical charge at all. a. Proton b. Neutron c. Electron d. Nucleus 19. Points in space that are so dense they create deep gravity sinks a. B l a c k H o l e s b. G r a v i t a t i o n a l L e n s i n g c. G a l a x y d. S o l a r S y s t e m 20. According to the Theory of Relativity, the speed of light in a vacuum is ______ for all observers? a. Different b. Dependent on the motion of the source of the light c. The same d. Dependent on the relative motion of the observer 21. Before the Theory of Relativity, what did scientists call the reference point for all motion? a. Focal point b. Ether c. The Sun d. The Earth 22. If the mass of an object changes, what will also change? a. The speed of light b. Distance c. Velocity d. Energy 23. The faster an object is moving in relation to an observer, the ______ it will appear to an observer. a. Longer b. Shorter c. Slower d. It will appear the same regardless of speed 24. You are riding in a spaceship that has no windows, radios, or other means for you to observe or measure what is outside. You wish to determine if the ship is stopped or moving at constant velocity. What should you do? a. You can determine if the ship is moving by determining the apparent velocity of light. b. You can determine if the ship is moving by checking your precision time piece. If it's running slow, the ship is moving. c. You can determine if the ship is moving either by determining the apparent velocity of light or by checking your precision time piece. If it's running slow, the ship is moving. d. You should give up because you have taken on an impossible task 25. The Michelson-Morley experiment was designed to measure a. The relativistic mass of the electron. b. The relativistic energy of the electron. c. The velocity of the Earth relative to the ether. d. The acceleration of gravity on the Earth's surface II. Computation - Show your complete solution on the problem below. 1. A spaceship carrying a light clock moves with a speed of 0.500c relative to an observer on earth. According to this observer, how long does it take for the spaceship’s clock to advance 1.00s? 2. Astronaut Benny travel to Vega, the fifth brightest start in the night sky, leaving his 35.0-year-old sister jenny behind on the earth. Benny travels with a speed of 0.990 c and Vega is 25.3 light years from earth. (a) how long does the trip take from the point of view of jenny? (b) How much has benny aged when he arrives at Vega? 3. An astronaut traveling with speed relative to earth takes her pulse and finds that her hearth beats once every 0.850s. mission control on earth, which monitors her heart activity observes one hearth beat every 1.40s. what is the astronaut’s speed relative to earth? 4. Calculate the number of photons a certain light wave has whose wave light measures 700 nm if the electromagnetic energy it represents is approximately 3x1017J. 5. Assuming a certain material has a photoelectric work function of 4.5 eV. Compute for the maximum energy of the photoelectron when UV light of 1.5x1015 Hz falls as a copper surface.
