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exam 4

A common source of wave motion is a

vibrating object
(sound waves are produce by vibrations of sound)

In a longitudinal wave the compressions and rarefactions travel in

same direction
Traverse wave (perpendicular)

Radio waves travel at the speed of light, 300,000 km/s. The wavelength of a radio wave received at
100 megahertz is

wave speed= frequency*wavelength

An object that completes 100 vibrations in 5 seconds has a period of

vibrations/ second
none of the above

A Doppler effect occurs when a source of sound moves

..either towards you or away from you.

The source of a sonic boom

must itself an emitter of sound

The pendulum with the greatest frequency is the pendulum with the

shortest lenght

A floating leaf oscillates up and down two complete cycles in one second as a water wave passes
by. The wave's wavelength is 10 meters. What is the wave's speed?

hrtz* meters

As a train of water waves goes by, a piece of cork floating on the water bobs up and down one
complete cycle each second. The waves are 2 meters long. What is the speed of the wave?


If at a concert you run toward the orchestra, the frequency of the sound you hear will be


A sound source of high frequency emits a high


Sound waves cannot travel in

a vacum

A wave having a frequency of 1000 hertz vibrates at

1000 cycles per second

The explanation for refraction must involve a change in


The phenomenon of beats results from sound


A 340-hertz sound wave travels at 340 m/s in air with a wavelength of


Inhaling helium increases the pitch of your voice. One reason for this is that sound travels

faster in helium than air

A piano tuner knows that a key on the piano is tuned to the frequency of his tuning fork when he
strikes them at the same time and the number of beats he hears each second is

if it is tune you do not hear anything

An ampere is a unit of electrical


Which statement is correct?

charge flows in a closed circuit

The current through a 10-ohm resistor connected to a 120-V power supply is

12 A

When a 10-V battery is connected to a resistor, the current in the resistor is 2 A. What is the
resistor's value?


The source of electrons lighting an incandescent ac light bulb is

atoms in the light bulb filament

When two lamps are connected in parallel to a battery, the electrical resistance that the battery
senses is

less than the resistance of either lamp

When two lamps are connected in series to a battery, the electrical resistance that the battery senses

more than the resistance of either lamp

When two 1-ohm resistors are connected in series, their combined resistance is

2 ohms and when in paralle., 1/2 ohm

If 0.8 A of current flow through a light bulb connected to a 120 V outlet, the power consumed is

Current * voltage

Electromagnetic waves consist of

oscillating electric and magnetic fields

Compared to ultraviolet waves, the wavelength of infrared waves is


Compared to radio waves, the velocity of visible light waves in a vacuum is

the same

Compared to its average speed in air, the average speed of a beam of light in glass is


Materials generally become warmer when light is

absorbed by them

A lunar eclipse occurs when the

moon passes into earth's shadow

The sensation of color is seen when light falls on the eye's


Which of the following cannot travel in a vacuum?

a sound wave

A pair of sunglasses and a pair of clear reading glasses are left in the sunlight. The hotter glasses
would be the


The incident light ray, the reflected light ray, and the normal between them

lie in the same plane

Object and image for a plane mirror lie

distance seen in the mirror is the same distance from the the mirror

To see his full height, a boy that is 1 meter tall needs a mirror that is at least

its always 1/2 the size

A diver shines light up to the surface of a smooth pond at a 10-degree angle to the normal. Some
light passes into the air above, and the part that reflects back into the water makes an angle to the
normal of

10 degrees
angle of incidence equal angle of refraction

Standing at the shore of a still lake, the reflected view of scenery on the far side of the lake is the
view you would see if you were upside down with your eye in the line of sight

directly beneath you, as far below water level as you are above

The inversion of your image in a plane mirror is actually an inversion of

front back
(plane mirror)

Atmospheric refraction makes the daylight hours a bit


Light refracts when traveling from air into glass because light

travels slower in glass then in air (refraction)

When you view a distant rainbow, each single water drop contributes to the bow

a single color
dispersions of light by a single drop

The type of lens that spreads parallel light is a

diverging lens

When seen from an airplane, a rainbow sometimes forms a complete circle. When this happens, the
plane's shadow is

in the center of the rainbow

If you wish to spear a fish with a regular spear, you should compensate for refraction between the
air and water and throw your spear

below the sighted fish

If you wish to send a beam of laser light to a space station that is just above the atmosphere near the
horizon, you should aim your laser

along your line of sight

A mirage occurs for road surfaces that are


If the speed of light in a medium is 2 × 108 m/s, the medium's index of refraction is

speed of light in a vacum / velocity in the material gives you N

electro magnetic spectrom lowest frequency


electro magnetic spectrom highest frequency


trend among wavelength and frequency

high wavelength low frequency and vise versa

list from longest to shortest wavelenghts

radio, microwaves, infrared, visible light, ultraviolet, x-rays, gamma rays

list from highest to lowest in average speed of light

vacuum, water, glass, diamond

they free electrons when light is shinning on in them


lunar eclipse

moon is in earth shawdow

solar eclipse

moon shadow falls in earth (umbra)

total shadow

umbra (sharp)

partial shawdow

penumbra (Fuzzy)

convex mirror

smaller image

concave mirror

larger image

law of reflection has to do with?

light and sound

diffuse reflection

occurs in rough surfaces

refracted light that bends toward and bends away

sped up , and slowed down

atmospheric refraction

is the cause of mirages

what does roy g biv stand for

bend more bend less
red, orange, yellow, green, blue, violet

converging lens

produce and upside down image


below 20 hertz


above 20,000 hertz

where does sound travel faster in liquids or in air?


reflection sound is

(hard surfaces cause greater echo)

sound bends upward and downward when ?

upward morning (warm air)
downward evening (cool air)

interference is a property of

light and sound

what is the difference between light and sound in wave properties

light is electromagnetic and sound is mechanical

trend in pendulum

longer the length of the pendulum longer the period

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