Science Bowl Practice Questions – Physics

Science Bowl Practice Questions Physics - 951. Short Answer: The focal length of a concave mirror is 2 meters. An object is positioned 8 meters infront of the mirror. Where is the image of this object formed?ANSWER: 8/3 METER or 2.66 METERS IN FRONT OF THE MIRROR52. Short Answer: A converging thin lens has a focal length of 27 centimeters. An object is placed 9centimeters from the lens. Where is the image of this object formed?ANSWER: -13.5 CENTIMETERS or 13.5 CENTIMETERS ON THE OBJECT SIDEOF THE LENS53. Short Answer: In Bohr's theory of the atom, what force was responsible for holding the electrons intheir orbit?ANSWER: COULOMB FORCE or THE FORCE OF ATTRACTION BETWEEN THE PROTON(NUCLEUS) AND THE ELECTRON54. Short Answer: Davisson and Germer scattered electrons from a crystal of nickel. The scatteredelectrons formed a strong diffraction pattern. What important conclusion was drawn from thisexperiment?ANSWER: ELECTRONS ACTED LIKE WAVES55. Short Answer: The speed at which a wave propagates down a string is 300 meters per second. If thefrequency of this wave is 150 Hertz, what is the wavelength of this wave?ANSWER: 2 METERS56. Multiple Choice: A standing wave is formed on a tightly stretched string. The distance between a nodeand an antinode is:w) 1/8 wavelengthx) 1/4 wavelengthy) 1/2 wavelengthz) 1 wavelengthANSWER: X -- 1/4 WAVELENGTH57. Multiple Choice: When a physical property such as charge exists in discrete "packets" rather than incontinuous amounts, the property is said to be:w) discontinuousx) abrupty) quantizedz) noncontinuousANSWER: Y – QUANTIZED58. Short Answer: Assume a ray of light is incident on a smooth reflecting surface at an angle of incidenceof 15 degrees to the normal. What is the angle between the incident ray and the reflected ray?ANSWER: 30 DEGREES59. Short Answer: The focal length of a concave spherical mirror is equal to 1 meter. What is the radius ofcurvature of this mirror?ANSWER: 2 METERS60. Short Answer: A virtual image can be formed by one or more of the following single mirrors? Identifythem.