Physics II Final True/False
A 5g subshell is capable of containing 22 electrons.
False
An astronomer measures the Doppler change in frequency for the light reaching the earth from a distant star. From this measurement, can the astronomer tell whether the star is moving away from the earth or the earth is moving away from the star?
False
For the circuit shown in the diagram below, the ratio of the current I1 in resistor R1 to the current in I2 in resistor R2 is I1/I2=R1/R2. (a parallel circuit is shown.)
False
It takes work to accelerate an electron from rest to a given speed close to the speed of light in a vacuum. Less work is required to accelerate the proton. Consider the following relationship: W = Fs and F=ma.
False
Light traveling through air is incident on a flat piece of glass at an angle of 35 degrees and enters the glass at an angle of refraction thetaglass. Suppose that a layer of water is added on top of the glass. Then, the light travels through the air and is incident on the water at an angle of 35 degrees. The light will enter the glass at a different angle thetaglass as it did when the water was not present.
False
Reversible processes result in an increase in the entropy of the universe.
False
The effect in which a changing current in one circuit induces an emf in another circuit is called self induction.
False
The electric force can only be attractive while the gravitational force can be either attractive or repulsive.
False
The power rating of a 1000W heater specifies the power that the heater uses when it is connected to an ac voltage of 120V. Evaluate the validity of the following statement: The total power used by two of these heaters when they are connected in series with a single ac voltage of 120V is 1000W.
False
Three point charges have identical magnitudes, but two of the charges are positive and one is negative. These charges are fixed to the corners of a square, one to a corner. No matter how the charges are arranged, the potential at the empty corner is always negative.
False
When the currents passing through two small parallel wires are directed opposite from one another, the two rods will experience an attractive force.
False
The spontaneous transfer of heat from a cold reservoir to a hot reservoir never occurring is a consequence of the 3rd law of thermodynamics.
False, 3rd law speaks of entropy in a closed system approaching a constant value
Latent heat is the amount of heat that must be supplied or removed to raise the temperature of a substance.
False, latent heat does not raise the temperature, but it does involve phase change.
A conducting loop moves at a constant speed parallel to a long, straight current-carrying wire as shown in the figure below. The induced current in the loop will be clockwise.
False, no flux = no induced current.
Electric field lines are drawn parallel to equipotential surfaces.
False, perpendicularly
A proton and an electron are held in place on the x-axis. The proton is at x = -d, while the electron is at x = +d. They are released simultaneously, and the only force that affects their motions significantly is the electrostatic force of attraction that each applies to the other. The proton and the electron will reach the origin at the same time.
False, the electron will reach the origin sooner (less massive of the two particles, higher velocity)
A diffraction pattern is produced on a viewing screen by using a single slit with blue light. The pattern broadens when the slit width is decreased.
True
A meter stick hurtles through space at a speed of 0.95c relative to you, with its length perpendicular to the direction of motion. You measure its length to be equal to 1.00 m.
True
A particle has a relativistic momentum of p. If its speed doubles, its relativistic momentum will be greater than 2p.
True
A positive charge accelerates from a region of higher potential toward a region of lower potential.
True
A rod made from insulating material carries a net negative charge. An electrically neutral sphere is connected to the ground via a conducting wire on the right-hand side of the sphere. The rod is held close to the left-hand side of the sphere but does not touch it. Electrons will flow from the sphere into the ground.
True
A sound wave has a much greater wavelength than does a light wave. When the two waves pass through a doorway, the sound wave diffracts to a greater extent.
True
A spherical mirror and a lens are immersed in water. Compared to the way that they work in air, one would expect the lens to be more affected by the water than the mirror.
True
An object carries a charge of -8.0 microCoulombs, while another carries a charge of -2.0 microCoulombs. In order for the objects to have the same charge, 1.9 x 10^13 electrons must be transferred from the first object to the second.
True
At a location near the equator, the earth's magnetic field points north. An electron is moving away from the earth's surface at this location. The direction of the magnetic force that acts on the electron points due east.
True
Capacitance, C, depends on neither the stored charge, q, nor on the potential difference, V, between the places of a capacitor because it is determined only by the physical properties of the capacitor.
True
For the circuit shown in the diagram below, the voltage V1 across resistance R1 is expressed as V1 = (V/R1+R2)R1. (a series circuit is shown in the diagram.)
True
If the outside surface (relative to the direction that incoming light is approaching) of a curved mirror is polished, we classify the mirror as convex.
True
If the speed c of light in a vacuum were infinitely large instead of 2.998 x 10^8 m/s, the effects of time dilation and length contraction would not be observable.
True
In diffuse reflection, the reflected rays have a disordered orientation.
True
Iron is a naturally occurring ferromagnetic material.
True
On a new temperature scale, the steam point is 348X and the ice point is 112X. The temperature on this scale that corresponds to 28C is 178X.
True
Some animals have hollow, air-filled hair strands while other animals have solid hair strands. Animals with hollow hair strands have an advantage for surviving in cold climates over animals with solid hair.
True
Suppose that you are using a microscope to view two closely spaced cells. For a given lens diameter, blue light achieves a better resolving power than red light. Consider the following relationship: thetamin = 1.22 (lambda/D)
True
The engine of a car possesses diathermal walls.
True
The fact that a spherical mirror does not bring all rays parallel to the principal axis to a single image point is known as spherical aberration.
True
The nuclear density has nearly the same value in all atoms.
True
The plane of a flat, circular loop of wire is horizontal. An external magnetic field is directed perpendicular to the plane of the loop. The magnitude of the external magnetic field is decreasing with time. Because of this decreasing magnetic field, an induced current is flowing clockwise in the loop, as viewed from above. According to Lenz's law, the direction of the external magnetic field is downward.
True
The refractive index of material A is greater than the refractive index of material B. A ray of light is incident on the interface between these two materials in a number of ways, as the drawings illustrate. The dashed lines denote the normals to the interfaces. Drawing 3 represents a situation that is not possible.
True
A stone is dropped from the top of a building. As the stone falls, its de Broglie wavelength decreases. Consider the following relationship: lambda = h/p = h/mv
True, because as momentum increases, the denominator gets smaller.