A toolbox (also called toolkit, tool chest or workbox) is a box to organize, carry, and protect the owner's tools. They could be used for trade, a hobby or DIY, and their contents vary with the craft. Engineering physics, or engineering science, refers to the study of the combined disciplines of physics, mathematics, chemistry, biology, and engineering, particularly computer, nuclear, electrical, electronic, aerospace, materials or mechanical engineering. Areas might include aerospace, biophysics, medical physics, renewable energy (photovoltaics, battery technology, fuel cells, ...), transportation, quantum information science, semiconductors, or materials development. Question: Is Engineering Physics hard? With both Engineering and Physics, the course is definitely challenging. It covers several aspects of a variety of different industries while most engineering courses cover only one industry.

1. QUANTUM
MECHANICS
ENGINEERING PHYSICS

2. WHAT IS
QUANTUM
MECHANICS ?
 Quantum mechanics is a
fundamental theory in physics
that provides a description of
the physical properties of
nature at the scale of atoms
and subatomic particles. It is
the foundation of all quantum
physics including quantum
chemistry, quantum field
theory, quantum technology,
and quantum information
science.

3. Unclassical Physics Quantum Physics
Deals with macroscopic
phenomena
Deals with
microscopic
phenomena
All physical quantities
are continuous.
E.g : momentum,
velocity
All physical quantities
are not continuous. It
has specific value at
specific point.

4. DRAWBACK :-
1. Instability of an atom :
 When an atom revolves around nucleus and it
is stable as per classical physics but quantum
physics.
2. Unable to explain spectrum of hydrogen :
 Radiations of hydrogen
3. Black body Radiation.

5. WEIN'S DISPLACEMENT LAW :-
 According to Planck's hypothesis, radiation is not emitted in continuous manner but in discrete packets
of energy called as quanta denoted by hv.
 Quanta in visible range is called photon.
 E=hv
 h=ML^2T^-2 = [ML^2T^-1]
T^-1
h= M[LT^-1] = mvr
Dimentional formula is same as angular momentum.
h= represents motion

6. WAVE PARTICLE DUALITY :-
 According to this theory photon can also have particle nature along with.
 1. Photoelectric effect :
 It is the phenomenon of ejection of electron from a metal surface, when a light of
suitable wavelength falls on it.
 No. Of photoelectrons α Intensity of incident light
 Velocity of Photoelectrons α frequency of incident light
 hv= 𝚽°+(½)mv^2 - K.E of ejected electron
𝚽°= hv°
(½)mv^2=h(v-v°)
This is called as Einstein photoelectric equation.
According to this our photon behaves as particle.

7. COMPTON EFFECT
 When high frequency radiation are scattered, then frequency of scattered photon is less that incident
radiation.
 Consider that an X-ray of frequency v incident upon a free electron at rest when it collides with
free electron at rest then it imparts some of its energy to electrons and scattered photon
has smaller energy and hence small frequency.
 Collision is relative (mass varies with velocity)
 Scattered photon make angle 𝚽 with incident photon and recoil.
 Part of energy of photon imparted to electron moving with velocity v left energy goes to
scattered photon.
 Parameters before collisions:
energy of incident photon = hv
Energy of electron = m°c^2 (m°= rest mass)
Momentum of photon = hv/c
Momentum of electron = 0

8.  Parameters after collision:
 Energy scattered photon = hv'
 Momentum of scattered photon = hv^2/2
 Energy of electron = mc^2 [m=m°/√1-v^2/c^2]
 Momentum of recoil electron = mv
 V= velocity of electron after collision
 Before collision, energy of system = hv + m°c^2
 After collision, energy of system = mc^2 + hv'

10. THANKYOU !
Made by :-
Arush Sachdeva
Deepanshu Pal
Devesh Singh
Batch :- CSE
Subject :- Engineering Physics
Subject teacher :- Monika ma'am
College :- GB Pant DSEU Okhla 1
campus