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50 Cards in this Set
- Front
- Back
Consider the diagram below, if line 1 is the incident light beam, which angle is the angle of reflection
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B, in between 3 and 4, right side
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The unit of electric potential difference between two points is a
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volt
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The particle easiest to remove from an atom is the
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electron
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Photons of which of the following colors of light possess the least energy
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green
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Resistance is a property of conductors that is measured in units of
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ohms
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The main reason for building large telescopes on the earths surface is to
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collect more light from faint objects
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A changing electric field will produce a
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magnetic field
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Of the following kinds of waves, the only ones that cannot travel through a vacuum (like outer space) are
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sound waves
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Light of which of the following wavelengths has the highest frequency?
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gamma-ray
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Which of the following types of EM radiation has the longest wavelength
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infra red
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The amplitude of the wave shown in the figure is
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B /\
__/_\_________ *see test* |
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The wavelength of the wave shown in the figure is
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D /\
_______ / \ |
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Two in phase waves with the same wavelength and of amplitude 5 constructively interfere. THe resulting wave
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10A
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V=IR is a statement of
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Ohm's Law
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Radio waves are
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light waves
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A positive and negative charge are initially 3 cm. apart. When they are moved closer together so that they are now only 1 cm apart, the force between them is
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9 times larger than before
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What is the wavelength of a 107.1 MHz radio wave?
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lambda=c/f
lambda=2.998*10^8 / 107.1*10^6 =2.799 * 10^6m |
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A set of Christmas tree lights is wired in series. What will happen if one of the lights burns out?
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all the lights will turn off
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To an astronaut in orbit many miles above Earth's atmosphere, the sky around him/her appears
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black
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In a longitudinal wave, the individual particles of the medium move
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parallel to the direction of travel
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In a transformer, if the primary coil contains more loops than the secondary coil then it is a
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step down transformer
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In the full wavelength range of electromagnetic radiation, visible light occupies what proportion of this possible range
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*
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Compared to the speed of light in a vacuum (or in deep space) light's speed in water or in glass is
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faster
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The Doppler effect is the change in the wavelength of light caused by the source
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moving with respect to the observer
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What type of lens is this
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concave )(
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An electric generator transforms
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mechanical energy into electrical energy
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You are looking at a penny at the bottom of a fountain that is 2m deep while standing on a sidewalk above it. To you the penny seems to be
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less than 2m deep
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When light of a particular frequency hits certain metallic surfaces, electrons are emitted by surface. This is a description of
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*
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Direct electric current cannot be used to operate
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transformers
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If an electron jumps from a lower energy level in an atom to a higher energy level, a photon is
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emitted
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A transformer whose primary coil has twice as many loops as its secondary coil is used to convert 240 V ac to 120 V ac. If the current in the secondary coil is 4 A, the primary current is
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N1/N2=I2/I1
240/120=4A/? cross multiply =2A |
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A space heater draws a current of 25 A when connected to a 220 V power source. Its resistance is
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R=I/C
R=25/220 =0.114 Ohms |
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White light is
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a mixture of all frequencies and colors of light
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A charge of +Q attracts a charge of -Q that is 5cm away with a force of F. Three more charges of +Q are placed next to the first one. The force on the charge of -Q is now
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*
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A ____ is a disturbance or vibration propagated from point to point in a medium or space
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wave
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Thomas Young performed a crucial experiment on the nature of light when he
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demonstrated the wave nature of light by passing light through two slits and obtaining a pattern of bright and dark bands on a screen that he correctly interpreted as interference between the two light beams
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Approximately how long does it take light to travel from fingertips of your extended arm to your eyes?
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*
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You are standing on the sidewalk. An ambulance with siren blaring approaches you, passes you, and then recedes into the distance. The wavelength of the sound waves emitted from its siren
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gradualy becomes shorter and shorter as the ambulance approaches you and then gradually becomes longer and longer as the ambulance recedes from you
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Consider an electrical transformer that has 10 loopson its primary coil and 20 loops on its secondary coil. What is the voltage in the secondary coil if the primary coil is supplied with 120 V?
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N1/N2=I2/I1
10/20=x/120 cross multiply =60V |
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When light passes through a prism of glass, the
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different colors or wavelengths of light are separated by he prisim
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A rainbow always appears
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in the part of the sky opposite from the Sun
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We explain light today
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as having both wave and particle behavior
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If you want to design a device that will detect animals at night by the radiation (heat) they give off, even if the night is totally dark, to what wavelength range should you make the device sensitive
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infrared
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The sun appears reddish as it sets because
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the blue wavelengths have already been scattered by the atmosphere
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Which type of telescope uses a mirror as the main optical element?
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reflecting telescope
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Sounds waves in air are
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longitudal
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What is the range of normal human hearing?
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20 to 20,000 Hz
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electrical current is measured in
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amps
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Coulomb's law for the force between electric charges belongs in the same general category as
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Newton's law of gravitation
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Who holds the patent for inventing the radio
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Nikola Tesla
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