# Shared Flashcard Set

## Details

MidTerm
One
17
Physics
10/13/2011

Term
 states that the angle of reflection is equal to the angle of incidence
Definition
 Law of Reflection
Term
 is a material having free having free charged particles that easily flow through it when an electric force acts on them
Definition
 Conductor
Term
 material is one through which light can pass instraight lines.
Definition
 transparent
Term
 of a wave is the distance between successive troughs.
Definition
 Wave Length
Term
 is a region of reduced pressure of the medium throughwhich a longitudinal wave travels.
Definition
 Rarefrection
Term
 primary colors are the three colors - red, blue, andgreen - that, when added in certain proportions, produce any other color in thevisiblelight part of the electromagnetic spectrum.
Definition
Term
 wave is one in which the medium vibrates in a directionparallel to the direction in which the wave travels.
Definition
 Longitudinal
Term
 states that an electric field is created in any region ofspace iri which a magnetic field is changing with time.
Definition
Term
 is a partial shadow that appears where some but notall of tlie light is blocked
Definition
 Penumbra
Term
 is a magnet whose field is produced by an electriccurrent.
Definition
 Electromagnet
Term
 the lowest part of a wave
Definition
 Trough
Term
 distance between successive crests , troughs, or identical parts of the wave
Definition
 Wavelength
Term
 for a wave or vibration, the maximum displacement on either side of the equilibrium position
Definition
 amplitude
Term
 A butterfly at eye level is 20 cm in front of a plane mirror. you are behind the butterfly, 50 cm from the mirror. What is the distance between your eye and the image of the butterfly" in the mirror?
Definition
 50 cm + 20 cm = 70 cm
Term
 A weight suspended from a spring is seen to bob up and dovm over a distance of 20 cm twice each second.   (a) What is its frpquency?   (b) What is its ptiriod?   (c) What is its amplitude?
Definition
 a. f=2Hz   b. T= 0.5 s   c. A= 10 cm
Term
 How long does it take for a pulse of laser light to reach the Moon and to bounce back to the Earth?
Definition
 T= 2.5 s
Term
 How much more intense than the threshold of hearing is a sound of   (a) 10 dB?   (b) 30 dB?   (c) 60 dB?
Definition
 a. 10   b. 10 x 10 x 10 = 1,000   c. 10 x 10 x 10 x 10 x 10 x 10 = 1,000,000
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