-
Home
- College physics for ap® courses
- 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.
Got questions? Get instant answers now!
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.)
Got questions? Get instant answers now!
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
.
Got questions? Get instant answers now!
Find the radius of a
nucleus.
is a manufactured nuclide that is used as a power source on some space probes.
Got questions? Get instant answers now!
(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)
Got questions? Get instant answers now!
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
.
Got questions? Get instant answers now!
What is the ratio of the velocity of a
particle to that of an
particle, if they have the same nonrelativistic kinetic energy?
Got questions? Get instant answers now!
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?
Got questions? Get instant answers now!
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.
Got questions? Get instant answers now!
(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
.
Got questions? Get instant answers now!
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] .)
Got questions? Get instant answers now!
(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?
Got questions? Get instant answers now!
Questions & Answers
it is the relatively stable flow of income
what is circular flow of income
branches of macroeconomics
what is Flexible exchang rate?
is gdp a reliable measurement of wealth
introduction to econometrics
Why is unemployment rate never zero at full employment?
bcoz of existence of frictional unemployment in our economy.
Umashankar
what is flexible exchang rate?
poudel
due to existence of the pple with disabilities
Abdulraufu
the demand of a good rises, causing the demand for another good to fall
is it possible to leave every good at the same level
Joseph
I don't think so. because check it, if the demand for chicken increases, people will no longer consume fish like they used to causing a fall in the demand for fish
Anuolu
is not really possible to let the value of a goods to be same at the same time.....
Salome
Suppose the inflation rate is 6%, does it mean that all the goods you purchase will cost
6% more than previous year? Provide with reasoning.
Not necessarily. To measure the inflation rate economists normally use an averaged price index of a basket of certain goods. So if you purchase goods included in the basket, you will notice that you pay 6% more, otherwise not necessarily.
Waeth
discus major problems of macroeconomics
what is the problem of macroeconomics
Yoal
Economic growth
Stable prices
and low unemployment
Ephraim
explain inflationcause and itis degre
increase in general price levels
WEETO
Good day
How do I calculate this question: C= 100+5yd G= 2000 T= 2000 I(planned)=200.
Suppose the actual output is 3000. What is the level of planned expenditures at this level of output?
how to calculate actual output?
Chisomo
how to calculate the equilibrium income
Beshir
Criteria for determining money supply
who we can define macroeconomics in one line
Muhammad
Aggregate demand
Mohammed
C=k100 +9y and i=k50.calculate the equilibrium level of output
nawalparasi district
from belatari
Amisha
I am Camara from Guinea west Africa... happy to meet you guys here
Sekou
ahile becheclor ho
Amisha
hjr ktm bta ho
ani k kaam grnu hunxa tw
Amisha
money as unit of account means what?
Kalombe
A unit of account is something that can be used to value goods and services and make calculations
Jim
all of you please speak in English I can't understand you're language
Muhammad
I want to know how can we define macroeconomics in one line
Muhammad
it must be .9 or 0.9
no Mpc is greater than 1
Y=100+.9Y+50
Y-.9Y=150
0.1Y/0.1=150/0.1
Y=1500
Kalombe
Mercy is it clear?😋
Kalombe
hi can someone help me on this question
If a negative shocks shifts the IS curve to the left, what type of policy do you suggest so as to stabilize the level of output?
discuss your answer using appropriate graph.
if interest rate is increased this will will reduce the level of income shifting the curve to the left ◀️
Kalombe
Got questions? Join the online conversation and get instant answers!
Source:
OpenStax, College physics for ap® courses. OpenStax CNX. Nov 04, 2016 Download for free at https://legacy.cnx.org/content/col11844/1.14
Google Play and the Google Play logo are trademarks of Google Inc.