21 Physics Questions (Please put in word document)
1.  Use the following photoelectric graph to answer the following question: What is the threshold frequency of the experimental photomissive material? (5 points)  

2.  Use the following photoelectric graph to answer the following question: If you use a different experimental photomissive material, what would be the same on the graph? (5 points)  

3.  Use the following halflife graph to answer the following question: What is the halflife of the isotope? (5 points)  

4.  Use the following halflife graph to answer the following question: When you are left with 6.25 mg of the radioactive isotope, how many halflives have occurred from time equals zero? (5 points)  

5.  Use the following halflife graph to answer the following question: When you are left with 6.25 mg of the radioactive isotope, how many minutes would have passed from time equals zero? (5 points)  

6.  Put the following in ascending order of mass: (5 points)  

7.  Which equation below would you use to determine the number of neutrons in a given nucleus when you are given the atomic number (Z) and atomic mass (A)? (5 points)  

8.  The nuclear force that binds the nucleons together in the atom is relatively (5 points)  

9.  Which particle will not be affected by the presence of an electric field? (5 points)  

10.  During nuclear fission, energy is released as a result of (5 points)  

11.  A neutral atom of aluminum has 14 neutrons and 13 protons. How many electrons does this aluminum have? (5 points)  

12.  Isotopes of the same element always have the same (5 points)  

13.  The magnitude of the charge on an electron compared to the magnitude of the charge on a proton (5 points)  

14.  Wave interference (5 points)  

15.  Match the parent nuclei with the daughter nuclei. (4 points)  

16.  Match the elements with the number of neutrons. (4 points)  

17.  Match the terms with their definitions. (4 points)  

18.  The electron has the positron as its antiparticle. (5 points)  

19.  Rutherford's Gold Foil experiment gave evidence that an atom is mostly empty space. (5 points)  

20.  Calculate the binding energy per nucleon of the Boron isotope B10, which has a nuclear mass of 10.012937 u. Remember to identity all of your data, write the equation, and show your work. Mass of Proton: 1.007825 uMass of Neutron: 1.008665 u 1 u = 931.5 MeV (5 points) 
21. In your own words, explain the effects of time dilation.
Tutor Answer
1. Threshold frequency is the minimum frequency that produces an electron, so the kinetic energy of the electron in this case should be zero, hence from the graph, at K.E = 0, we obtain frequency = 0.5 E 14 Hz, which is the fourth choice.2. This graph poses a slope that equals to Planck’s constant, we can see this from the relation K.E = h Work function, so our slope will be constant for whatever massive particle we use and it’ll equal Planck’s constant, hence the correct choice is the third one.3. Halflife time is the time needed for the radioactive substance to loose half of its mass as a radiation, hence we can detect that only half of its mass is left, and from the graph, we started by 50 mg, so half the mass is 25 mg, and from the graph, this happens at t=1 min, which is the first choice.4. We can do this question by starting at t=0 and the mass is 50 mg, the first halflife time we got at t=1 and the mass then is 25 mg, once more the time should be t=2 and the mass left is 12.5 mg, do it once more, time should be t=3 and the mass now is 12.5/2 = 6.25 mg. Counting the number of halflive times till we reach 6.25 mg, we get that it reached it in 3 times, so the correct choice is the second one.5. Again like the previous question, we got the 6.25 mg after 3 min, and we can get this also from the graph, so the correct choice is the second one.6. Ordering the mass of electron, neutron and proton ascendingly, means starting from the lowest to the highest, we know that electron is way less than proton and neutron, and the neutron is slightly more than proton, so the order should be: Electron, Proton, Neutron, which is the fourth choice.7. The number of protons is the atomic number, while the number of protons + neutrons give the mass number, hence the number of neutrons = mass number  atomic number, putting this into symbols gives: N=AZ, which is the fourth choice.8. The force that overcome the electrostatic repulsion between pr...
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