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- Radioactivity and nuclear physics
- Substructure of the nucleus
Test prep for ap courses
A typical carbon nucleus contains 6 neutrons and 6 protons. The 6 protons are all positively charged and in very close proximity, with separations on the order of 10
-15 meters, which should result in an enormous repulsive force. What prevents the nucleus from dismantling itself due to the repulsion of the electric force?
- The attractive nature of the strong nuclear force overpowers the electric force.
- The weak nuclear force barely offsets the electric force.
- Magnetic forces generated by the orbiting electrons create a stable minimum in which the nuclear charged particles reside.
- The attractive electric force of the surrounding electrons is equal in all directions and cancels out, leaving no net electric force.
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Section summary
Conceptual questions
Problems&Exercises
Verify that a
mass of water at normal density would make a cube 60 km on a side, as claimed in
[link] . (This mass at nuclear density would make a cube 1.0 m on a side.)
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Find the length of a side of a cube having a mass of 1.0 kg and the density of nuclear matter, taking this to be
.
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Find the radius of a
nucleus.
is a manufactured nuclide that is used as a power source on some space probes.
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(a) Calculate the radius of
, one of the most tightly bound stable nuclei.
(b) What is the ratio of the radius of
to that of
, one of the largest nuclei ever made? Note that the radius of the largest nucleus is still much smaller than the size of an atom.
(a)
(b)
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The unified atomic mass unit is defined to be
. Verify that this amount of mass converted to energy yields 931.5 MeV. Note that you must use four-digit or better values for
and
.
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What is the ratio of the velocity of a
particle to that of an
particle, if they have the same nonrelativistic kinetic energy?
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If a 1.50-cm-thick piece of lead can absorb 90.0% of the
rays from a radioactive source, how many centimeters of lead are needed to absorb all but 0.100% of the
rays?
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The detail observable using a probe is limited by its wavelength. Calculate the energy of a
-ray photon that has a wavelength of
, small enough to detect details about one-tenth the size of a nucleon. Note that a photon having this energy is difficult to produce and interacts poorly with the nucleus, limiting the practicability of this probe.
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(a) Show that if you assume the average nucleus is spherical with a radius
, and with a mass of
u, then its density is independent of
.
(b) Calculate that density in
and
, and compare your results with those found in
[link] for
.
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What is the ratio of the velocity of a 5.00-MeV
ray to that of an
particle with the same kinetic energy? This should confirm that
s travel much faster than
s even when relativity is taken into consideration. (See also
[link] .)
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(a) What is the kinetic energy in MeV of a
ray that is traveling at
? This gives some idea of how energetic a
ray must be to travel at nearly the same speed as a
ray. (b) What is the velocity of the
ray relative to the
ray?
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Questions & Answers
Discuss the differences between taste and flavor, including how other sensory inputs contribute to our perception of flavor.
taste refers to your understanding of the flavor . while flavor one The other hand is refers to sort of just a blend things.
Faith
While taste primarily relies on our taste buds, flavor involves a complex interplay between taste and aroma
Kamara
which drugs can we use for ulcers
Omeprazole
Cimetidine / Tagament
For the complicated once ulcer - kit
Patrick
what is the function of lymphatic system
to drain extracellular fluid all over the body.
asegid
The lymphatic system plays several crucial roles in the human body, functioning as a key component of the immune system and contributing to the maintenance of fluid balance. Its main functions include:
1. Immune Response: The lymphatic system produces and transports lymphocytes, which are a type of
asegid
to transport fluids fats proteins and lymphocytes to the blood stream as lymph
Adama
Anatomy is the identification and description of the structures of living things
Kamara
what's the difference between anatomy and physiology
Anatomy is the study of the structure of the body, while physiology is the study of the function of the body. Anatomy looks at the body's organs and systems, while physiology looks at how those organs and systems work together to keep the body functioning.
AI-Robot
what is enzymes all about?
Enzymes are proteins that help speed up chemical reactions in our bodies. Enzymes are essential for digestion, liver function and much more. Too much or too little of a certain enzyme can cause health problems
Kamara
how does the stomach protect itself from the damaging effects of HCl
little girl okay how does the stomach protect itself from the damaging effect of HCL
Wulku
it is because of the enzyme that the stomach produce that help the stomach from the damaging effect of HCL
Kamara
function of digestive system
function of digestive
Ali
what is the normal body temperature
please why 37 degree selcius normal temperature
Mark
the normal temperature is 37°c or 98.6 °Fahrenheit is important for maintaining the homeostasis in the body
the body regular this temperature through the process called thermoregulation which involves brain skin muscle and other organ working together to maintain stable internal temperature
Stephanie
anaemia is the decrease in RBC count hemoglobin count and PVC count
Eniola
what is the pH of the vagina
how does Lysin attack pathogens
Diya
I information on anatomy position and digestive system and there enzyme
anatomy of the female external genitalia
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Source:
OpenStax, College physics for ap® courses. OpenStax CNX. Nov 04, 2016 Download for free at https://legacy.cnx.org/content/col11844/1.14
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