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Quantum Mechanics

To determine
A detailed explanation behind larger atomic size with larger Planck’s constant, h.

ecoanuncios7x 2022-10-02

Factor 2 in Heisenberg Uncertainty Principle: Which formula is correct?
Some websites and textbooks refer to
$Δ x Δ p \geq \frac{ℏ}{2}$
as the correct formula for the uncertainty principle whereas other sources use the formula
$Δ x Δ p \geq ℏ .$
Question: Which one is correct and why?
The latter is used in the textbook "Physics II for Dummies" (German edition) for several examples and the author also derives that formula so I assume that this is not a typing error.
This is the mentioned derivation:
$\sin θ = \frac{λ}{Δ y}$
assuming $θ$ is small:
$\tan θ = \frac{λ}{Δ y}$
de Broglie equation:
$λ = \frac{h}{p_{x}}$
$\Rightarrow \tan θ \approx \frac{h}{p_{x} \cdot Δ y}$
but also:
$\tan θ = \frac{Δ p_{y}}{p_{x}}$
equalize $\tan θ$ :
$\frac{h}{p_{x} \cdot Δ y} \approx \frac{Δ p_{y}}{p_{x}}$
$\Rightarrow \frac{h}{Δ y} \approx Δ p_{y} \Rightarrow Δ p_{y} Δ y \approx h$
$\Rightarrow Δ p_{y} Δ y \geq \frac{h}{2 π}$
$\Rightarrow Δ p Δ x \geq \frac{h}{2 π}$

Aryan Lowery 2022-10-02

Consider a proton with a 6.6 fm wavelength. What is the velocity of the proton in meters per second? Assume the proton is nonrelativistic. (1 femtometer $= 10^{- 15}$ m)

KesseTher12 2022-09-29

If X-rays with a wavelength of $4.50 \times 10^{- 12}$ m are used in a Compton Effect experiment and are scattered at an angle of ${53.0}^{\circ}$ . What is the wavelength of the scattered radiation?

ct1a2n4k 2022-09-27

In the Compton effect, what is the greatest change in wavelength that can occur?

Amaris Orr 2022-09-26

Explain the photon model of the electromagnetic waves.

Mainuillato2p 2022-09-26

Using dimensional analysis, predict the units of wavelength in the de Broglie hypothesis equation: $λ = \frac{h}{m v}$
joule-seconds ( $J \cdot s$ )
kilogram (kg)
meters (m)
seconds (s)
meters per second (m/s)
per second (/s)
per meter (/m)
per kilogram (/kg)

trkalo84 2022-09-26

Find the change in wavelength of 85 pm x-rays that are scattered $15^{\circ}$ by a target.

Mainuillato2p 2022-09-25

Consider a flat, thin, perfectly reflective square mirror of mass m lying on edge on a frictionless, horizontal surface that is met by an electromagnetic wave with Poynting vector parallel to the normal to the square. Suppose the EM wave recoils from the square with the same outgoing momentum (and thus energy). That is, suppose the incoming wave has momentum p and recoils with momentum -p. To conserve momentum, the square recoils with momentum 2p, and thus has kinetic energy $\frac{2 p^{2}}{m}$ . Where did the kinetic energy of the square come from?

shaunistayb1 2022-09-25

At what velocity will an electron have a wavelength of 1.00 m?

Liberty Page 2022-09-25

After a 0.800-nm x-ray photon scatters from a free electron, the electron recoils at $1.40 \times 10^{6} m / s$ . What is the scattering angle?

ct1a2n4k 2022-09-25

If matter has a wave nature, why is this wave - like characteristic not observable in our daily experiences?

Stacy Barr 2022-09-24

In the Davisson-Germer experiment using a nickel crystal, a second-order beam is observed at an angle of 55 degrees. For what value of acclerating voltage does this occur?

lunja55 2022-09-24

Why does gamma radiation have a low ionising ability?

Jackson Garner 2022-09-23

Suppose there is light of high enough frequency so it causes photoelectric effect (in a piece of metal). Does such light cause photoelectric effect on free electrons as well?

mikioneliir 2022-09-23

Why wave nature of particles is not observed in daily life.

zakownikbj 2022-09-22

Everybody knows that all physics systems absorb light quanta, any material thing can absorb light quanta. But the reverse question is , can light absorb energy and therefore changes its frequency? If not, please give me some fundamentals or equations that prohibit this from happening.

redolrn 2022-09-05

A beam of 1.2 MeV photons are incident on a 2 mm lead shield.
a) What is the fraction uncollided flux exiting the shield?
b) What fraction initially interacts by Photoelectric Effect?

Hope Hancock 2022-09-01

What other shielding material than lead is effective against gamma rays?

Quantum mechanics problems and solutions belong to one of the most complex aspects of Physics because it takes several disciplines to get things done. It is exactly why we have a plethora of different questions that are asked by engineers, designers, programmers, data scientists, and students who do not have sufficient skills in Physics. Take your time to study quantum mechanics examples and explore the answers that have been offered. There are also de Broglie equation problems that focus on the wave properties of matter and the nature of the electrons that will help you. If you need to experiment with the other types of Quantum Mechanics and explore the radiation physics, make sure to che

Quantum Mechanics

Real-Life Examples of Quantum Mechanic