Physical Science Exam 2

the molecules of a gas are much farther apart than molecules in a solid or liquid

(t or f)

True

The nutritionists capital “c” Calorie is more accurately known as a kilocalorie

(t or f)

true

Iron heats up more rapidly than aluminum does because it has a greater specific heat
(t or f)

false

Liquid water at 0C has to give up energy in order to become ice at 0C

(t or f)

true

the attractive forces between unlike molecules is called…

adhesion

what is the average body temperature of healthy humans on the Celsius scale?…

37C

molecules in a solid…

are held in nearly fixed positions by strong attractive forces

The process by which solid ice vaporizes into the atmosphere without first becoming a liquid is called…

sublimation

when water in the air condenses and forms tiny bubbles on a cold soda can,…

it transfers heat to the surroundings

in the equation: q= mc change t, the c represents the…

specific heat

The touch sensors our human bodies use to judge temperature operate…

very poorly, sensing only heat flow

the heat needed to warm one gram of water one celsius degree is called a…

calorie

The water in a swimming pool is often cooler than the surrounding sidewalk on a sunny day because it…

has a higher specific heat

The transfer of heat that occurs when energy moves from molecules to molecule by direct contact is called

conduction

adding heat to a substance…

sometimes does not result in a temperature change

through which medium will sound travel most rapidly…

steel

sound waves in air…

are longitudinal waves
are produced by something vibrating
undergo refraction when they pass through warm and cold air

the time that is required for a vibrating object to complete one full cycle is called…

period

longitudinal waves with a frequency above 20000 Hz are…

ultrasonic

if v= upside down Yf , then how are upside down Y and f related

upside down Y is inversely proportional to f

transverse mechanical waves can pass through…

solids

in longitudinal waves, the medium…

vibrates in the same direction the wave is moving

The characteristic of a sound wave that you interpret as loudness is related to…

amplitude

reflected sound waves that are heard within 0.1 s…

undergo a gain in volume

the higher the frequency of sound wave…

the higher the pitch

the bending of a wave passing through a boundary between two different substances is called…

refraction

The lowest frequency possible in a vibrating string undergoing resonance is…

the fundamental frequency
determines the pitch of the musical note sounded
has one antinode

when the trough of one wave collides at the same time and place as the crest of otherwise identical wave…

destructive interference occurs

what is the range of normal human hearing…

20 to 20000 Hz

condensation in a longitudinal wave corresponds to what part of a transverse wave…

crest

resonance occurs at an…

natural frequency

a sound that is perceived as twice as loud requires…

ten times the intensity

you are able to hear sounds from farther away on a cool night because sound waves are refracted toward…

cooler air near the ground

when riding in a car moving away from a stationary loud horn, that observed sound wave has a pitch that is seemingly…

getting larger in wavelength

sound waves that stack up due to a quickly moving source are known as a…

sonic boom