21 Physics Questions (Please put in word document)

Anonymous
timer Asked: Jun 7th, 2018
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Question description

1.

Use the following photoelectric graph to answer the following question:

Graph titled Photoelectric Effect for a Photomissive Metal is shown. The y axis is labeled kinetic energy and scales from negative 2 to positive 4 electron volts. The x axis is labeled frequency from 0 to 11 times 10 to the 14 hertz. A straight line connects the points 0, negative 1.2 and 5.5, 1 and 9, 2.5.

What is the threshold frequency of the experimental photo-missive material? (5 points)

9.0 E14 Hz
5.5 E14 Hz
2.9 E14 Hz
0.5E 14 Hz
2.

Use the following photoelectric graph to answer the following question:

Graph titled Photoelectric Effect for a Photomissive Metal is shown. The y axis is labeled kinetic energy and scales from negative 2 to positive 4 electron volts. The x axis is labeled frequency from 0 to 11 times 10 to the 14 hertz. A straight line connects the points 0, negative 1.2 and 5.5, 1 and 9, 2.5.

If you use a different experimental photo-missive material, what would be the same on the graph? (5 points)

The y-intercept
The intercept
The slope
3.

Use the following half-life graph to answer the following question:

A graph titled half-life graph of a radioactive isotope is shown with mass remaining on the y axis from 0 to 60 grams and time on the x axis from o to 6 minutes. A curve connects the points 0, 50 and 1, 25 and 2, 12.5 and 3, 6.25 and 4, 3.125 and 5, 1.5625

What is the half-life of the isotope? (5 points)

1.0 min
3.0 min
5.0 min
6.0 min
4.

Use the following half-life graph to answer the following question:

A graph titled half-life graph of a radioactive isotope is shown with mass remaining on the y axis from 0 to 60 grams and time on the x axis from o to 6 minutes. A curve connects the points 0, 50 and 1, 25 and 2, 12.5 and 3, 6.25 and 4, 3.125 and 5, 1.5625

When you are left with 6.25 mg of the radioactive isotope, how many half-lives have occurred from time equals zero? (5 points)

1
3
6
12
5.

Use the following half-life graph to answer the following question:

A graph titled half-life graph of a radioactive isotope is shown with mass remaining on the y axis from 0 to 60 grams and time on the x axis from o to 6 minutes. A curve connects the points 0, 50 and 1, 25 and 2, 12.5 and 3, 6.25 and 4, 3.125 and 5, 1.5625

When you are left with 6.25 mg of the radioactive isotope, how many minutes would have passed from time equals zero? (5 points)

1.0 minutes
3.0 minutes
6.0 minutes
12 minutes
6.

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

Proton, neutron, electron
Electron, neutron, proton
Proton, electron, neutron
Electron, proton, neutron
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)

N = A + Z
N = A/Z
N = AZ
N = A - Z
8.

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

weak and has a long range
strong and has a long range
weak and has a short range
strong and has a short range
9.

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

Alpha
Beta+
Beta-
Neutron
Proton
10.

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

a light nucleus splitting
a heavy nucleus splitting
the joining of heavy nuclei
the joining of light nuclei
11.

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

1
13
14
27
12.

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

AMU number
A-number
Z-number
13.

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

is greater
is smaller
is the same
14.

Wave interference (5 points)

is a property of light
occurs when light and water interact
is a property of all waves
15.

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

1.234 90 Thorium plus 4 2 Helium
2.234 91 Protactinium plus 0 negative 1 electron
3.7 4 Beryllium plus 0 negative 1 electron
4.222 86 Radon plus 4 2 Helium
a.Thorium234
b.Lithium7
c.Radium226
d.Uranium238
16.

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

1.39 19 Potassium
2.88 38 Strontium
3.14 6 Carbon
4.127 53 Iodine
a.8
b.74
c.50
d.20
17.

Match the terms with their definitions. (4 points)

1.Element
2.Photon
3.Isotopes
4.Nuclear fission
a.Atoms with same atomic number but different mass numbers
b.Splitting of an atom into two or more parts
c.A bundle or quantum of light
d.An atom with a unique number of protons
18.

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

True
False
19.

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

True
False
20.

Calculate the binding energy per nucleon of the Boron isotope B-10, 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 u
Mass 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

eslamalaasabra1
School: New York University

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. Half-life 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 half-life 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 half-live 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=A-Z, which is the fourth choice.8. The force that overcome the electrostatic repulsion between pr...

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Anonymous
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