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51: In Bohr's theory of the atom, what force was responsible for holding the electrons in their orbit?ANSWER : COULOMB FORCE or THE FORCE OF ATTRACTION BETWEEN THE PROTON (NUCLEUS) AND THE ELECTRON
52: Davisson and Germer scattered electrons from a crystal of nickel. The scattered electrons formed a strong diffraction pattern. What important conclusion was drawn from this experiment?
ANSWER : ELECTRONS ACTED LIKE WAVES
53: The speed at which a wave propagates down a string is 300 meters per second. If the frequency of his wave is 150 Hertz, what is the wavelength of this wave?
ANSWER : 2 METERS
54: A standing wave is formed on a tightly stretched string. The distance between a node and an antinode is:
w) 1/8 wavelength
x) 1/4 wavelength
y) 1/2 wavelength
z) 1 wavelength
ANSWER : X -- 1/4 WAVELENGTH
55: When a physical property such as charge exists in discrete "packets" rather than in continuous amounts, the property is said to be:
w) discontinuous
x) abrupt
y) quantized
z) noncontinuous
ANSWER : Y – QUANTIZED Science Bowl PHYSICS
56: Assume a ray of light is incident on a smooth reflecting surface at an angle of incidence of 15 degrees to the normal. What is the angle between the incident ray and the reflected ray?
ANSWER : 30 DEGREES
57: The focal length of a concave spherical mirror is equal to 1 meter. What is the radius of curvature of this mirror?
ANSWER : 2 METERS
58: A virtual image can be formed by one or more of the following single mirrors? Identify them.
w) plane mirror
x) concave spherical mirror
y) convex spherical mirror
z) all of the above
ANSWER : Z -- ALL OF THE ABOVE (accept: A, B and C)
59: A quarter of a wavelength is equal to how many degrees of phase?
ANSWER : 90 DEGREES
60: An organ pipe which is open at both ends resonates at its fundamental frequency. Neglecting any end effects, what wavelength is formed by this pipe in this mode of vibration 0f the pipe is 2 meters long?
w) 2 meters
x) 4 meters
y) 6 meters
z) 8 meters.
ANSWER : X -- 4 METERSScience Bowl PHYSICS
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