Physics- Test 2
An electrically neutral atom has equal numbers of electrons and __________
Protons
The atomic number is the number of _______ in an atom's nucleus
Protons
Which of the following statements is not true? Protons and electrons have equal masses All protons have the same charge Protons and electrons have charges equal in magnitude but opposite in sign The positive charge in an atomic nucleus is due to the protons is contains
Protons and electrons have equal masses
Electromagnetic waves transport
energy
When waves go from one place to another, they transport
energy
A cake of Ivory soap placed in a bathtub of water floats. The buoyant force on the soap is
equal to its weight
The atomic number of an element is the number of
protons in its nucleus
If an object is placed at 2F of a converging lens (in class example), the image formed will be
real, inverted and the same size as the object
Light of which color has the lowest frequency?
red
A pencil in a glass of water appears bent. This is an example of
refraction
As a sample of a radionuclide decays, its half life
remains the same
When a black plastic rod is rubbed with a piece of fur
electrons are transferred from the fur to the plastic rod
Electric power can be calculated using the equation
(current)(voltage) or IV
A temperature of 100 degrees C is equal to what temperature on the Fahrenheit scale?
212 degrees
A candy bar contains 220 dietary calories (220 C). What is the energy content of the candy bar in kilocalories?
220 kcal
After 10 years, 75 g of an original sample of 100 g of a certain radionuclide had decayed. The half life of the nuclide is
5 years
Which of the following statements is not correct? Matter is composed of tiny particles called molecules These molecules are in constant motion, even in solids All molecules have the same size and mass The differences between the solid, liquid, and gaseous states of matter lie in the relative freedom of motion of their respective molecules
All molecules have the same size and mass
The particles that are like helium nuclei are called _______ particles
Alpha
Which type of radiation has the least ability to penetrate matter?
Alpha particles
The relationship between pressure and volume in gas when the temperature of the system is held constant is called
Boyle's law
The high pressure part of a sound wave is called a (an)____________
Compression
A __________ is a substance through which electric charge can flow
Conductor
The basic unit of electric charge is the _________
Coulomb
High energy and high frequency electromagnetic waves emitted from an atom that have too much energy are called ___________
Gamma rays
Which type of radiation has the greatest ability to penetrate matter?
Gamma rays
The method of removing the charge from an object is called ___________
Grounding
The ________ of a radioactive nuclide is the period of time required for one-half of the initial amount of the nuclide to decay
Half life
Resonance occurs when an object vibrates at one of its ________ frequencies
Natural
In the Rutherford model of the atom, the positive charge is concentrated in a central _______
Nucleus
The property of a conductor that ________ the flow of charge passing through it is resistance
Opposes
In a longitudinal wave, the particles of a medium move ________ to the wave direction
Parallel
The particles of a medium move _______ to the wave direction in a transverse wave
Perpendicular
A converging lens forms a(an)_________ image
Real
The bending of light as it passes from one medium to another is called _____________
Refraction
Superconductivity is the loss of all electrical _________ by certain materials at extremely low temperatures
Resistance
The image in the plane mirror (like used in our experiment ) is a _________ image
Virtual
Electric power, P, is the product of current, I and _______
Voltage
Electromagnetic waves differ from mechanical waves in their ability to travel through a ________ as well a matter
Vacuum
It is impossible to lower the temperature of a gas to absolute zero (assuming that such a low temperature can be reached) because
all known gases turn into liquids before absolute zero is reached
Which one of the following wave quantities is not related to the others? Speed Frequency Amplitude Wavelength
amplitude
An electron is emitted by an atomic nucleus in the process of
beta decay
The basic idea of the Rutherford atomic model is that the positive charge in an atom is
concentrated at its center
Due to the fact that the speed of light in glass varies with frequency, light of each color is refracted to a different extent. The effect is called
dispersion
The type of head transfer called radiation
does not require the presence of matter, that is, a vacuum
The energy of electromagnetic waves resides in its
electric and magnetic fields
The ampere is the unit of
electric current
Atoms and molecules are "normally"
electrically neutral
Radio waves and x-rays are examples of
electromagnetic waves
A stationary observer hears the whistle of an approaching train. To the observer the frequency of the sound produced by the whistle appears to be
higher as the train approaches the observer and lower as the train moves away from the observer
The Doppler effect occurs
in all types of waves
The elementary particle that has no electric charge is the
neutron
A negative charge
interacts with both positive and negative charges
If the angle at which light enters certain materials is shallow enough, the light will be bent back into the glass. This phenomenon is called
internal reflection
Sound waves are
longitudinal
Ohm's law (V=IR) hold only for
metallic conductors
In ray tracing, a ray that passes through the "center of the lens" will
not be deviated as it passes through the lens
Nearly all the volume is occupied by matter consisted of
nothing that is, empty space
Superconductivity occurs in certain substances
only at very low temperatures
A small plastic ball is suspended by an insulating filament. When a charged plastic rod touches it
some of the charge is transferred from the plastic rod to the plastic ball
Which type of waves can't travel through a vacuum?
sound waves
Diffraction refers to
the bending of waves around the edge of an obstacle in their path
The speed of sound waves having a frequency of 256 Hz compared with the speed of sound waves having a frequency of 512 Hz is
the same
When you step onto a tile floor, your feet feel much colder than when you step onto a carpet. This is because
the tile takes heat away from your feet faster than the carpet
The half-life of a radionuclide is
the time need for half a sample to decay
Bimetallic strips composed of two different metals having a different rate of thermal expansion are used in
thermostats
The fluid at the bottom on a container is ( think of being at the bottom of a swimming pool)
under more pressure than the fluid on top
The image formed by diverging (concave) lens of an object is which one of the following? Inverted Virtual Real Larger than the object
virtual
The distance from crest to crest of any wave is called its
wavelength
Gamma rays have the same basic nature as
x-rays
Two waves have the same frequency have equal but opposite amplitudes, -A and +A. If they meet exactly in step at the same point, the resulting amplitude is
zero