# PHY 101 exam 4

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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
3.0m

### 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

shortest lenght

hrtz* meters

hrtz*meters

increased

pitch

a vacum

### A wave having a frequency of 1000 hertz vibrates at

1000 cycles per second

speed

interference

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

speed/hertz=wavelenght
1m

### 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

f1-f2=0
if it is tune you do not hear anything

current

### Which statement is correct?

charge flows in a closed circuit

12 A

ohms

### 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 i

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

longer

the same

less

absorbed by them

cones

a sound wave

sunglasses

### 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

front back
(plane mirror)

longer

### 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

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

warm

### 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

red

violet

### 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

metals

### lunar eclipse

moon is in earth shawdow

### solar eclipse

moon shadow falls in earth (umbra)

umbra (sharp)

penumbra (Fuzzy)

smaller image

larger image

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

### ultrasonic

above 20,000 hertz

liquids

### reflection sound is

echo
(hard surfaces cause greater echo)

### sound bends upward and downward when ?

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

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
NOT DEPENDENT ON MASS

Example: