Unification Unification Grand Unified Theories (GUTs), string theory, unification theory, 1 / 10 A unified theory predicts that the energy of a particle is split between two fields such that the ratio of energies is 3:2. If the total energy is 50 J, what is the energy in the second field? 20 J 30 J 25 J 10 J 2 / 10 In a theory unifying gravity and electromagnetism, a test mass experiences an additional force due to a modified potential V = kQq/r^3. What happens to the force as r doubles? Decreases by 1/2 Decreases by 1/4 Decreases by 1/8 Decreases by 1/16 3 / 10 The unification of forces predicts a particle with mass 1.6 x 10^-27 kg and charge 1.6 x 10^-19 C. What is the force acting on it in an electric field of 10^4 N/C? 1.6 x 10^-15 N 1.6 x 10^-23 N 1.6 x 10^-21 N 1.6 x 10^-19 N 4 / 10 In a unified field theory model, the electromagnetic and gravitational fields interact. If the gravitational potential is 10^-5 and the electromagnetic field strength is 10^3, what is the resultant field strength in normalized units? 1.00001 x 10^3 1.001 x 10^3 10^3 0.999 x 10^3 5 / 10 A unification theory suggests that the force between two particles is inversely proportional to the square of the distance between them. If the force at 2 m is 50 N, what is the force at 5 m? 8 N 20 N 10 N 4 N 6 / 10 What evidence would directly support unification of gravity with other forces? Observation of W bosons Detection of gravitons Measurement of dark energy Observation of quantum tunneling 7 / 10 Why is gravity difficult to unify with the other forces? Gravity operates at shorter distances. Quantum effects of gravity are hard to observe. Gravity has a separate quantum particle. Gravity is not a fundamental force. 8 / 10 In string theory, unification of forces is achieved by proposing that: Particles are one-dimensional strings. Gravity is stronger than other forces. Electrons orbit strings. Forces are separate dimensions. 9 / 10 Which of the following is a limitation of current unification theories? Lack of symmetry principles Lack of experimental evidence for supersymmetry Inability to incorporate quantum mechanics Failure to unify strong and weak forces 10 / 10 Grand Unified Theories (GUTs) attempt to unify which forces? Strong, weak, and electromagnetic forces All four fundamental forces Weak nuclear and gravitational forces Electromagnetic and gravitational forces Your score is By WordPress Quiz plugin
