PHY1020C Test 3
The planet Earth loses heat mainly by
radiation
If you heat an ice bucket of water for several hours until only a small amount of ice remains, the temperature of water will be
0 degrees Celsius
How many joules does it take to vaporize 1 gram of water?
2255J
Near the top of a mountain, water in an open pot boils at
a lower temperature than at sea level
A standing wave occurs when
a source wave and its reflected wave in phase
Warm air rises because faster-moving molecules tend to move to regions of less
density and less pressure
When you touch a cold piece of ice with your finger, energy flows
from your finger to the ice.
Steam burns are more damaging than burns caused by boiling water because steam
gives up change of phase energy when it condenses. has more energy per kilogram than boiling water. Choices A and B are both correct.
As atmospheric pressure is increased, the boiling temperature of a liquid
goes up
Which of the following expands most when the temperature is increased? Equal volumes of
helium
The moderate temperatures of islands throughout the world has much to do with water's
high specific heat
Food in a pressure cooker is cooked faster because of the
high temperatures reach in a sealed container
A sound source of high frequency has high
pitch
Which of the follow is not a transverse wave?
sound
Wave interference occurs for
sound waves, light waves, and water waves (all of the above are correct)
The explanation for refraction must involve a change in
speed
Sound travels fastest in
steel
Both black and white road surfaces absorb sunlight. At the end of a sunny day the warmer road surface will be
the black surface.
The frequency of a simple pendulum depends on
two of these (length and mass)
The food in a refrigerator is cooled by
vaporization of the refrigerating fluid.
If you add heat for 35 minutes to a pan with 2 kgs of 100°C water in it the temperature of the remaining water will be
100 degrees Celsius
An object that completes 20 vibrations in 10 seconds has a frequency of
2 hertz
The approximate range of human hearing is
20 hertz to 20,000 hertz
Before ice can form on a lake, all the water in the lake must be cooled to
4 degrees C
The speed of a sound wave in air depends on
air temperature
The Doppler effect is a characteristic of
all of the above choice (water, sound, and light waves)
The vibrations of a longitudinal wave move in a direction
along the direction of wave travel
The technology for orbiting solar power plants
already exists.
Like a transverse wave, a longitudinal wave has
amplitude, frequency, wavelength, and speed
The vibrations of a transverse wave move in a direction
at right angles to the direction of wave travel
Heat energy is measured in units of
both joules and calories (Choices A and B are both true)
A dolphin perceives its environment by the sense of
both sight and sound
Which body glows with electromagnetic waves?
both the Sun and the Earth
When a bimetallic bar made of copper and iron strips is heated, the bar bends toward the iron strip. The reason for this is
copper expands more than iron
A Doppler effect occurs when a source of sound moves
either towards you or away from you
When warm air rises, it
expands and cools
Compared to a glass of ice water with ice in it, on a warm day a glass of pure ice-cold water without ice will warm up
faster
Energy transfer by convection is primarily restricted to
fluids
For FM radio, the F stands for
frequency
Which of the following normally warms up fastest when heat is applied?
iron
Your feet feel warmer on a rug than on a tile floor because a rug
is a better insulator than tile.
When the air pressure is lower
it takes less heat to boil water
If we slowly pump out all the air over a bowl of water until it is in a vacuum,
it will boil, then freeze
When an iron ring is heated, the hole becomes
larger
A sound wave is a
longitudinal wave
Compressions and rarefactions are characteristic of
longitudinal waves
Metals are both good heat conductors and good electrical conductors because of the
looseness of outer electrons in metal atoms.
The frequencies of sound that carry farther in air are
low
A substance that heats up relatively quickly has a
low specific heat
The fact that desert sand is very hot in the day and very cold at night is evidence that sand has
low specific heat
Adding pressure to ice causes ice to
melt
A node is a position of
minimum amplitude
To say that one wave is out of phase with another is to say that the waves are
reaching maximum amplitude at different times.
When a gas is changed to a liquid state, the gas
releases energy
The pendulum with the greatest frequency is the pendulum with the
shortest length
The natural frequency of an object depends on its
size, shape, and elasticity
The higher the temperature of an object
the shorter the wavelengths it radiates.
A wiggle in time, but not in space, is a
vibration
When water in the vapor phase condenses to liquid in the air, the surrounding air
warms