Physics Exam 2. Ch. 9
Which of the following quantities represent mass?
0.34 g 120 kg
What is the magnitude of Earth's gravitational force on a 1-kg body at Earth's surface?
10 N
What is the same in Einstein's first postulate?
All laws of nature in all uniformly moving frames of reference
Which color light is the result of a greater energy transition, red or blue?
Blue
What classical idea about space and time did Einstein reject?
Einstein rejected the idea that space and time are independent. Submit
What happens to the force of attraction between two planets when the distance between them is doubled?
The force decreases to one quarter.
How does the force of gravity between two bodies change when the distance between them is doubled?
The force decreases to ¼ of its initial value.
State Newton's law of universal gravitation in words. Then do the same with one equation.
The force is proportional to the product of two masses and inversely proportional to the square of the distance between their centers: F ~ m1m2/d2.
How does the number of wavelengths vary with the orbital number of the shell?
The number of wavelengths increases corresponding to the orbital number of the shell.
What remains constant in Einstein's second postulate?
The speed of light in a vacuum.
Predict how the upward force exerted on the feet by the scale will compare to the weight if the elevator is moving downward at a constant speed.
The upward force on the feet will be equal to the weight.
Predict how the upward force exerted on the feet by the scale will compare to the weight of the person if the elevator is moving upward at a constant speed.
The upward force on the feet will be equal to the weight.
Predict how the upward force exerted on the feet by the scale will compare to the weight if the elevator is accelerating downward.
The upward force on the feet will be less than the weight.
Predict how the upward force exerted on the feet by the scale will compare to the weight if the elevator is accelerating upward.
The upward force on the feet will exceed the weight.
How does the wavelength of the waves in the orbital shells change as you increase the orbital shell number?
The wavelength increases
What is the common feature among the waves associated with all of the orbital shells?
There is an integer number of wavelengths in each shell.
Why are occupants of the International Space Station weightless?
They are in free fall.
What did Johannes Rydberg and Walter Ritz discover about atomic spectra?
They discovered that the spectral lines of any element include lines with frequencies that are the sums and differences of the frequencies of other lines.
Which of the following quantities would be acceptable representations of weight?
Weight is a force and is measured in newtons (or kilonewtons, meganewtons, etc.) or in pounds (or tons, megatons, etc.). 12.0 lbs 1600 kN 899 MN
Bohr's correspondence principle states that if a new theory is valid, it must _________.
account for the verified results of older theories
The spectra of atoms reveals their _________.
electron structure and atomic identity Submit
What explanation tells us why electrons don't spiral into the attracting nucleus?
electrons behave like a standing wave, not like a charged particle in an orbit that would lose energy and emit radiation.
If acceleration due to gravity on the earth is g, which formula gives the acceleration due to gravity on Loput?
g=5.6/1.7^2 Name Mass ( Mearth) Radius ( Rearth) Tehar 2.1 0.80 Loput 5.6 1.7 Cremury 0.36 0.30 Suven 12 2.8 Pentune 8.3 4.1 Rams 9.3 4.0
After Punch Taut travels to Pentune, what actually happens to his mass and his weight?
mass remains the same; weight decreases
An object is lifted from the surface of a spherical planet to an altitude equal to the radius of the planet. As a result, which of the following changes in the properties of the object take place?
mass remains the same; weight decreases
Which has the greater wavelength?
photons emitted from a TV transmitter
Which has greater frequency?
photons emitted from an ultraviolet lamp
Which has the greater energy?
photons emitted from an ultraviolet lamp
Which has the greater momentum?
photons emitted from an ultraviolet lamp
The gravitational field on the surface of the earth is stronger than that on the surface of the moon. If a rock is transported from the moon to the earth, which properties of the rock change?
weight only
According to de Broglie model, how many wavelengths compose an electron wave in the first orbit? In the second orbit? In the nth orbit?
1, 2, n
If she walks at 1 km/hkm/h down the aisle toward the front of a train that moves at 80 km/hkm/h, what is her speed relative to the ground?
81 km/h
When is your weight measured as mg?
For a non-accelerating mass near the surface of Earth
Time is required for light to travel along a path from one point to another. If this path is seen to be longer because of motion, what happens to the time it takes for light to travel this longer path?
It takes longer
The following diagrams show five pairs of asteroids, labeled with their relative masses (M) and distances (d) between them. For example, an asteroid with M=2 has twice the mass of one with M=1 and a distance of d=2 is twice as large as a distance of d=1. Rank each pair from left to right based on the strength of the gravitational force attracting the asteroids to each other, from strongest to weakest.
M=2 d=1 M=2 M=1 d=1 M=2 M=1 d=1 M=1 M=1 d=2 M=2 M=1 d=2 M=1
According to Niels Bohr, can a single electron in one excited state give off more than one photon when it makes a single jump to a lower energy state?
No! There can only be one
When a flashing light source approaches you, does the speed of light or the frequency of light - or both - increase?
Only frequency increases
What is the relationship between the energy differences of energy levels in an atom and the light emitted by the atom?
The energy difference is directly proportional to the frequency of emitted light.
Would the springs inside a bathroom scale be more compressed or less compressed if you weighed yourself in an elevator that was accelerating upward? Downward?
More compressed while accelerating upward, but less compressed while accelerating downward
If the acceleration due to gravity on the earth is 9.8 m/s2, what is the acceleration due to gravity on Rams?
5.7 m/s2
How does a cathode ray respond when a magnet is brought nearby?
A cathode ray is deflected.
How do measurements of time differ for events in a frame of reference that moves at 50% of the speed of light relative to us? At 99.5% of the speed of light relative to us?
For 0.50c, time dilates to 1.15 times the proper time. For 0.995c, time dilates to 10 times the proper time.
Each of the following diagrams shows a spaceship somewhere along the way between Earth and the Moon (not to scale); the midpoint of the distance is marked to make it easier to see how the locations compare. Assume the spaceship has the same mass throughout the trip (that is, it is not burning any fuel). Rank the five positions of the spaceship from left to right based on the strength of the gravitational force that Earth exerts on the spaceship, from strongest to weakest.
Gravity follows an inverse square law with distance, which means the force of gravity between Earth and the spaceship weakens as the spaceship gets farther from Earth.
What did Johann Jakob Balmer discover about the spectrum of hydrogen?
He discovered a mathematical formula that described the pattern of wavelengths in the line spectra of hydrogen.
What did J. J. Thomson discover about the cathode ray?
He discovered the existence of electrons.
What does the wave function ΨΨ represent?
It can be used to calculate the probability of the result of an experiment.
In what sense does the Moon "fall"?
It falls away from the straight path that it would follow if there were no forces acting on it.
Which planet should Punch travel to if his goal is to weigh in at 118 lb? Refer to the table of planetary masses and radii given to determine your answer.
Pentune
How does the probability cloud of the electron in a hydrogen atom relate to the orbit described by Niels Bohr?
The average distance of the cloud from the nucleus is close to that of the radius of the Bohr orbit.
What did Robert Millikan discover about the electron?
The charge and the mass of the electron
