1. Homework Statement
If an atom in energy level 1, how many absorption spectral lines can an atom exhibit due to transition between 3 levels? How about 4 and 5 levels? And also in emission?
2. Homework Equations
Concept
3. The Attempt at a Solution
I am confused one book says it can...
1. Homework Statement
Objects X and Y, shown below, are released fronm rest in outer space. The only force acting on the objects is their mutual gravitational attraction. The mass of X is one-half that of Y. With respect to the original rest frame, the magnitude of the acceleration of X is...
1. Homework Statement
Photons incident upon free electrons that are essen- tially at rest are scattered by the electrons. As a consequence, the electrons gain kinetic energy. How do the frequency and speed of the photons present after the scattering compare to those present before the...
1. Homework Statement
If X represents the intensity of monochromatic blue light and Y represents the energy of each photon of the light, which one is the correct graph below?
2. Homework Equations
KE=hƒ-∅, where ∅ is the work function
Energy of a photon= hƒ
3. The Attempt at a Solution...
1. Homework Statement
True statements about Jupiter as it moves in its elliptical orbit around the Sun include which o the following?
I. It has its greatest speed when closest to the Sun.
II. It has its greatest potential energy when farthest from the Sun.
III. The magnitude of its...
1. Homework Statement
In the figure below, Two wave sources, M and N, are vibrating in phase on the surface of water and generate waves of wavelength λ. Which of the following values for the distances MP and NP will result in minimum disturbance at a particular point P on the surface of the...
1. Homework Statement
If an object moves in a circular path with a speed that increases at a constant rate, which of the following can be concluded?
(A) The radial component of the force acting on the object is zero.
(B) The net force acting on the object is zero.
(C) The net force acting...
1. Homework Statement
A large and a small ball, made of the same uniform density foam, are released at the same time from a point 100 meters above Earth. After 1 second the large ball is observed to have fallen farther than the small ball. Which of the following explains this observation?
(A)...
1. Homework Statement
The figure below shows a block attached to a pulley and a string.
1) which quantity has essentially the same nonzero value at all three points?
2) which quantity changes direction at point Z?
3)which quantity is zero at point Y?
2. Homework Equations
Restoring force...
1. Homework Statement
In the figure below, the volume expands while the pressure is constant. What happens when this gas expands?
A) heat is added and temperature increased
B) heat is removed and temperature decreasesd
C) heat is added and temperature decreased
D) heat is removed and...
1. Homework Statement
What causes electric field? What causes magnetic field?
(I) stationary electric fields
(II) moving electric charges
(III) a changing magnetic field
IV) a current-carrying wire
2. Homework Equations
E=F/q
B=μI/2πr
E electric field
F elecric force
Q charge
B magnetic field...
1. Homework Statement
I have had a question in my quiz that I don’t remember very well, but here’s a diagram and there’s no need for numbers in axis because it’s a concept- based question with no calculations.
The question asks if an ideal gas system moved from A-B-C-A. Where is the process...
Δ1. Homework Statement
Below
2. Homework Equations
Potential energy = kinetic energy
MgΔY=1/2 mΔv^2
Vf^2=Vi^2+2gx1
3. The Attempt at a Solution
For question 49, I used the first equation, and the result is Δv^2=2gY. Then, solving for x1 in the second equation, I got x1=Δv^2 / 2g...
1. Homework Statement
In the file below.
2. Homework Equations
Speed= total distance over total time.
Acceleration = change of speed over time
3. The Attempt at a Solution
I tought it is just E because of the first rule above. But then I doubt my answer since it moved with constant...
1. Homework Statement
A photon of wavelength 300nm is emitted from an atom when an electron makes a transition from an energy state of -4 eV to a state of -8 eV. IF the initial state had been at enerygy of -6 eV, the wavelength of the photon emitted in a transition to -8eV is..??
2. Homework...
1. Homework Statement
In the attached file..
The question asks about the charge and capacitance after being separated by twice the original separation. I also need to know if it is kept connected to the battery( spearted to twice the distance,too) , what would happen to both the charge and...
1. Homework Statement
Below
2. Homework Equations
Y=1/2 *gt^2
X=Vt
Vf=Vi+gt
3. The Attempt at a Solution
The ball will have the same final velocity as Its initial. So, using the last equation 0=5+gt, where g is 10. Therefore, time to reach the maximum height is half seconds. To reach the...
1. Homework Statement
in the attached file
2. Homework Equations
Momemtum = mass - velocity
3. The Attempt at a Solution
I solved it E. Since object 2 has the larger mass, the effect is less and will move backwards a little bit.
1. Homework Statement
Which graphy represents the potential energy of the block as a function of time?
2. Homework Equations
PE=mgh
3. The Attempt at a Solution
First, the potential energy is zero until it reache the top of the incline where the potential energy is maximum. Moving down, the...
1. Homework Statement
In the attached file file.
2. Homework Equations
None
3. The Attempt at a Solution
In both cases Earth’s gravitational force always acts. For the sled, there is a force opposing the motion which can both be the frictional force between the sled and the hill and air...
1. Homework Statement
In the file
2. Homework Equations
No equations needed
3. The Attempt at a Solution
I answered it C. Since I learned that at the tip there are most of the charges. Therefore, it’s the point of the greatest E field magnitude. But another tutor told me that it is a...
1. Homework Statement
The question askes about the path of the electron. I need to know if I am doing it correctly whether it was asked for a proton or an electron.
2. Homework Equations
F=QV⊥Bsinθ
3. The Attempt at a Solution
I answered it C. Because it is an electron, I used my left...
1. Homework Statement
In addition to the question given in the attached file below, I don’t understand how is the polarity changing periodically.
2. Homework Equations
Concept-based question, I guess.
3. The Attempt at a Solution
I have no idea how should I approach the question. So, if...
1. Homework Statement
In the attached file.
2. Homework Equations
No equations needed.
3. The Attempt at a Solution
I answered it B. Not sure,though. If it is a thick rope the frequency decreses; therefore, the speed decreases.
1. Homework Statement
Satellite 1 has mass m1 & radius R1 and satellite 2 has mass m2 and radius 2R1
Which satellite’s speed is greater?
Question and my attempt are shown in the attached file.
2. Homework Equations
V= √GM/R
3. The Attempt at a Solution
I am not sure if my steps are correct...
1. Homework Statement
In the attached file
2. Homework Equations
Kinematics equations.
3. The Attempt at a Solution
The question asks about vertical component. Isn’t this always 0? Like in C the intial velocity is the horizontal velocity but the vertical one is 0. Same applies to all. Am I...
1. Homework Statement
the question asks at which point is the string moving upward at the instant shown?
2. Homework Equations
No equations needed
3. The Attempt at a Solution
I am not sure how I should approach this type of questions.
A) will move downward
B) downward then upward
C)...
1. Homework Statement
Stated in the attached file.
2. Homework Equations
Wavelength = 2 times length divided by harmonic
I don’t know if it’s the relevant equation
3. The Attempt at a Solution
I used the equation I wrote. So, if the left side is 10cm longer, I guess it might be 2(10).
1. Homework Statement
The question is in the pic.
2. Homework Equations
3. The Attempt at a Solution
I answered it B. Still i am not quite sure whether it is B or E. I assumed some numbers, though.
1. Homework Statement
In order for the refracted ray R to have the same direction in space as the incident ray I, shown above, which of the following conditions by itself would be sufficient? (A) n1=n2 (B) n1=n3 (C) n2=n3 (D) Plane surface P, is parallel to plane surface P2- (E) None of the...