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