In "Sado Adachi" book "Properties of Group-IV, III–V
and II–VI Semiconductors" page 222, he reported that "both εs and ε∞ decrease almost linearly with increasing pressure", however i was not able to find any empirical formula to describe these relationship for materials InAs, InP, InSb, where...
I wonder why newton second law, define force as mass x acceleration, acceleration is the second time derivative of displacement, why he didn't define the force as mass x higher order time derivatives of displacement
I am looking for a family of curves where if we consider one curve of them and get the tangent of that curve at any arbitrary point on the curve, then you will always find a point in the other curves where the tangent of this point is perpendicular to the tangent of the first point.
My guess...
I derived the shortest distance between two points on a spherical surface (Great Circle Distance) , using the definition of the spherical coordinates and the dot product of the position vectors r1 and r2 where
r1 = ( R cosθ1 cosφ1 , R cosθ1 sinφ1 , R sinθ1 )
r2 = ( R cosθ2 cosφ2 , R cosθ2 sinφ2...
Homework Statement
At what energy will a non-relativistic calculation of the De Broglie wavelength of an electron be in error by 5%? What is this energy for a proton? Comment on your results.
Homework Equations
I have two (seemed to be) logical answers for this question, but with different...
I want to know how this integral will equal zero?
I know that Ψ will fall to zero as x goes to infinity
and i know that Ψ must fall to zero very quickly , Ψ must fall to zero faster than 1/√|x|
all of this will help evaluating this integral
i tried to solve it as follows
The first term...
As far as i understand the thing that matter in all of the process of mutual inductance is the rate of change of the current in the primary coil $$\frac{dI}{dt}$$
butting soft iron core will increase the density of the magnetic field inside the primary coil, but how this will effect...
Homework Statement
please check attachment
Homework Equations
please check attachment
The Attempt at a Solution
since the deviation from f_0 to f is linear
then we can write f=f_0 + C where C is some constant
this should be enough to prove the first question (i think so)
for the second...
i know that bathroom scales measures the normal force, hence the equivalence mass
but if we took earth rotation into account then the normal force will be less by a value mv2/R
according to this relation
N = mg -mv2/R
Example : a 70 kg man standing on a bathroom scale on the equator ...
could we able to measure the velocity for a free particle with uncertainty equal to zero, could we able to have a certain values for its velocity, and let the uncertainty of the position to be infinity
is there any theoretical restrictions on having a certain value for the velocity?
is there...
Hi,
i was studying Classical Mechanics course introduced by the brilliant Prof. V. Balakrishnan
he was studying the phase portrait of a simple harmonic oscillator in one dimension , where the total enegry of the system is E=\frac{1}{2}m\dot{q}^{2}+\frac{1}{2}mω^{2}q^{2} where E is constant...
i thought that electrons are merely abstract thing or statistical entities, so i mitigated every attempt to visualize them as something that has a shape like a sphere, has a radius, internal structure,
i thought that any attempt to measure a radius (if any) could result in uncertainty in...
please read this problem
"An astronaut traveling in a spaceship aims his flashlight to an object inside the spaceship, the beam of light moves on the same direction as the direction of motion of the ship, he observed the time interval between the light leaves the flashlight and when it hits...
A hollow, conducting sphere is initially uncharged. A positive charge, +q1, is placed inside the sphere (at the center). Then, a second positive charge, +q2, is placed near the sphere but outside it.
Which of the following statements describes the net electric force on each charge?
1-There...
An archerfish shoots at a target 2.00 m away, at an angle of 30.0o above the horizontal. With what velocity must the water stream be launched if it is not to drop more than 3.00 cm vertically on its path to the target?
i have troubles with this problem (Physics for scientists and engineers...
Hi,
In case of alpha decay from Uranium atoms, i thought the barrier is the strong nuclear force, but i had seen many textbooks saying that it is electrical barrier,
and i did rethink the subject and i imagined it as a barrier that have electrical force from one side and strong nuclear force...
Hi,
I am wondering why the scalar product of two vectors the way it is, i mean why it wasn't ABtanθ instead of ABcosθ, or XAB, while X is any constant value, why mathematicians define it that way, the same story goes on for the vector product,
why we even had two types of products defined...
Hi all
I am wondering about the concept of Mass in physics. What does it mean? , why we have different concepts of mass? , Why scientists anciently proposed two concepts of mass, inertial mass and gravitational mass? , Why they wondered if they are equivalent, while if i was a one of their...
Hello All
i want to study theoretical physics and get a degree and then follow my post graduate studies, but i have to main problems, first is that i can't attend to much because i am working as a full time programmer so i need to find a reputable university that can offer the degree by long...