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  1. YMMMA

    Confused about the number of absorption lines

    Got the difference, thanks!
  2. YMMMA

    Confused about the number of absorption lines

    So why in question 5 didn’t we include transitions from n=3 to n=2 and n=2 to n=1, and n=3 to n=1...
  3. YMMMA

    Confused about the number of absorption lines

    So they are indeed three possible transitions.
  4. YMMMA

    What is the magnitude of acceleration?

    Probably yes. That’s a different book though.
  5. YMMMA

    Confused about the number of absorption lines

    I forgot to post the problem,too.
  6. YMMMA

    What is the magnitude of acceleration?

    Because in the answer key it is C, the same, so I had to check:rolleyes:
  7. YMMMA

    Confused about the number of absorption lines

    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...
  8. YMMMA

    What is the magnitude of acceleration?

    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...
  9. YMMMA

    What are the frequency and speed of a photon after scattering

    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...
  10. YMMMA

    Which graph represents the Energy of a photon vs intensity?

    I don’t know why the answer key says it is C, so I had to check on my understanding.
  11. YMMMA

    Which graph represents the Energy of a photon vs intensity?

    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...
  12. YMMMA

    Elliptical orbit/ determine speed & potential energy

    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...
  13. YMMMA

    Path length differences/ interference problem

    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...
  14. YMMMA

    Why the large ball falls farther than the smaller one?

    It’s very clear now, Thank you!
  15. YMMMA

    Why the large ball falls farther than the smaller one?

    I am able to prove D is true now after doing the math. I appreciate your help all. Milion thanks!!
  16. YMMMA

    Why the large ball falls farther than the smaller one?

    So, D) is also not correct because it must be smaller for the larger ball. That leaves C.
  17. YMMMA

    Why the large ball falls farther than the smaller one?

    Ah, I got that. So, the larger ball has more area and thus more force of drag.
  18. YMMMA

    Why the large ball falls farther than the smaller one?

    This fraction is smaller for the larger ball. Actually I don’t know. Is that a rule or something?
  19. YMMMA

    Why the large ball falls farther than the smaller one?

    Well, I don’t remember seeing anything related to water vapor in my book. That test sometimes asks general questions that can be understood using logic but I am struggling with those.. But I did understand E now that @Delta² explained.
  20. YMMMA

    Why the large ball falls farther than the smaller one?

    This rule has nothing to do with surface area, I mean it doesn’t contribute to the acceleration of the balls. I doubt what I did, though.
  21. YMMMA

    Circular motion/ speed increases at a constant rate

    It is velocity squared divided by the radius. But the velocity is increasing, so it should increase as well. Right?
  22. YMMMA

    Why the large ball falls farther than the smaller one?

    I am not sure about my free body diagram, but here it is anyway... The net force is downward for the large ball to have it accelerate more thant the smaller one. So again it has less mass. Still I am confused between E and D. Can’t understand them either. I can only think of E as it says that...
  23. YMMMA

    Circular motion/ speed increases at a constant rate

    So yeah, I looked for this lesson, non-uniform circular motion, and got that because it speeds up it has a radial and tangential acceleration. Thus, It has a net acceleration, and for the force it also has a radial, tangential and a net force. That means I have to choose between E and D. I am...
  24. YMMMA

    Why the large ball falls farther than the smaller one?

    Ahh, I didn’t know that F depends on the surface area. Now I can tell that the larger ball has a larger surface area. That means it has greater force exerted on it (air resistance) so it accelerates faster.
  25. YMMMA

    Why the large ball falls farther than the smaller one?

    If one ball has a larger size than the other, and both balls have the same density or mass-to- volume ratio, that means the larger ball has the greater area.
  26. YMMMA

    Why the large ball falls farther than the smaller one?

    Isn’t it just a=F/m as @PeroK said? The greater the mass the less it will accelerate.
  27. YMMMA

    Why the large ball falls farther than the smaller one?

    I just know that air resistance slows down motion. For buyonat forces, It is not in any chapter of an SAT physics book that I studied from. But I searched anyway and got that If the byoyant force in the air is greater than the density of the object, that will slow the motion. If it is less than...
  28. YMMMA

    Why the large ball falls farther than the smaller one?

    I didn’t write down any equations because I thought it doesn’t depend on any. But for choices A and B it’s all about gravitational force and weights, which are essentially the same Fg=W=mg. But it has to be the other way around for the larger ball to fall farther; the smaller ball should then...
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