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An electron moving with velocity v has momentum 3 x 10 -26 Kg.m/s. The de Broglie wavelength associated with it is ______. Value of h = 6.63 x 10-34 is.
NTS 2019
Physics
Dawn of Modern Physics
Elimination Tool:
Which of following has greatest energy
Einstein was given a Nobel prize for:
PMC 2021 Tested
Physics
Dawn of Modern Physics
Elimination Tool:
What will be the energy in Joules, when an electron acquires a speed of 10 m/s?
NTS 2016 DUHS & JSMU
Physics
Dawn of Modern Physics
Elimination Tool:
The existence of positron was discovered in the:
PMC Sample 3
Physics
Dawn of Modern Physics
Elimination Tool:
In Compton’s effect the wavelength of the scattered photon is
Planck’s constant is analogous to:
PMC Practice 6
Physics
Dawn of Modern Physics
Elimination Tool:
Which statement is universally correct?
Which of the following Is correct?
Calculate the energy of a photon of wavelength 6600 Angstroms:
PMC Practice 5
Physics
Dawn of Modern Physics
Elimination Tool:
What will be the energy of electron travelling at 10^7 m/s
Heisenberg uncertainty principle states:
Compton shift is maximum at:
PMC 2021 Tested
Physics
Dawn of Modern Physics
Elimination Tool:
Physics is an experimental science which depends heavily on:
NTS 2016 SMBBMC
Physics
Dawn of Modern Physics
Elimination Tool:
A 5 watt LED bulb converts 80% of the power into light photons wavelength 660 nm. What is the number of photons emitted from the bulb in one second.
UHS 2018
Physics
Dawn of Modern Physics
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Anti matter theory was proposed by: a) Einstein b) Bohr
The concept of work function was given by:
PMC Sample 2
Physics
Dawn of Modern Physics
Elimination Tool:
When an electron and its antiparticle positron come close enough to each other, they completely convert into radiation energy in the form of photons, this process is called:
NTS 2018
Physics
Dawn of Modern Physics
Elimination Tool:
Earth is a/an frame of reference
In order to produce pair production the minimum energy of photon required is:
NTS 2019
Physics
Dawn of Modern Physics
Elimination Tool:
Gamma-ray (?) can produce ionization in which of the following way/s?
I. It may lose all its energy in a single encounter with the electron of an atom (Photoelectric effect).
II. It may lose only a part of its energy in an encounter (Compton effect).
III. Very few of very high energy ? ray photons may impinge directly on heavy nuclei, be stopped and annihilated giving rise to electron-positron pairs (The materialization of energy).
NTS 2013
Physics
Dawn of Modern Physics
Elimination Tool:
The de Broglie wavelength of an electron travelling with a speed of 1.0 x 107m/s is equal to, (h=6.6 x 10-34 Js and me= 9.1 x 10-31 kg)
UHS 2018
Physics
Dawn of Modern Physics
Elimination Tool:
The number of LED segments used in a calculator display:
NUMS 2015
Physics
Dawn of Modern Physics
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Value of Wien’s constant is?
If temperature on Kelvin scale Is reduced to half, what would be the effect on the energy of radiations?
The photocell is similar to:
PMC Practice 5
Physics
Dawn of Modern Physics
Elimination Tool:
Gamma rays cause photoelectric emission when their energy is
Presence of Photon was confirmed by
What will be the energy of an X-ray quantum of wave length 1.0 x 10-10 m?
NTS 2016 SMBBMC
Physics
Dawn of Modern Physics
Elimination Tool:
The Bohr’s postulate for stationary orbits of Hydrogen atoms _____. Here m is the mass of the electron, v velocity, r orbital, and h is Planck’s constant.
NTS 2019
Physics
Dawn of Modern Physics
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The charge of a photon is:
PMC Sample 1
Physics
Dawn of Modern Physics
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Sunlight will emit photo electrons when striking which of the following
When an observer moves with velocity of light, relative to a timing device at rest, he would notice:
NUMS 2015
Physics
Dawn of Modern Physics
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Black body radiations were first observed by:
Minimum energy required to eject an electron from metal surface is called:
UHS 2019
Physics
Dawn of Modern Physics
Elimination Tool:
Momentum of a photon is?
PMC Practice 2
Physics
Dawn of Modern Physics
Elimination Tool:
The maximum Compton shift Is at
Who proposed matter waves?
The phenomena in which certain metals emit electrons when exposed to high-frequency light is known as?
NTS 2014
Physics
Dawn of Modern Physics
Elimination Tool:
If frequency of incident light is increased beyond threshold frequency, keeping light intensity constant, then:
NUMS 2019 Reconduct
Physics
Dawn of Modern Physics
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The series limit for the Balmer series of hydrogen spectrum occurs at 3664 A. Calculate Ionization energy of hydrogen atom.
NTS 2013
Chemistry
Dawn of Modern Physics
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Scattering of photon by electron is termed as:
theory of was Relativity proposed by
Who was awarded Nobel Prize (1921) for explanation of Photoelectric Effect?
If Compton shift is half of Compton wavelength, then the scattering angle would be:
Which group consists of only electromagnetic waves?
PMC Sample 1
Physics
Dawn of Modern Physics
Elimination Tool:
The absolute standard of rest is:
) Twin paradox Is consequence of?
Which of the following color has maximum energy?
White light gives spectrum after undergoing:
PMC Sample 2
Physics
Dawn of Modern Physics
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The energy equivalent to 0.9 mg is? a) 9 x 1091 b) 8.1 x 10″J •
X-rays are used to investigate:
PMC Sample 3
Physics
Dawn of Modern Physics
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The value and units of the Planck constant ‘h’ can be expressed as:
UHS 2019
Physics
Dawn of Modern Physics
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The uncertainty in momentum and position is due to its:
PMC Sample 1
Physics
Dawn of Modern Physics
Elimination Tool:
Which light photon has the least momentum?
PMC Practice 6
Physics
Dawn of Modern Physics
Elimination Tool:
Black body emits which of the following radiations:
In the Compton Scattering experiment the X-ray wavelength change Δλ is ___________. Here h is Planck constant, m rest mass of electron and θ is angle after scattering.
NTS 2019
Physics
Dawn of Modern Physics
Elimination Tool:
According to Einstein, bodies and light rays follow a:
NUMS 2015
Physics
Dawn of Modern Physics
Elimination Tool:
In Einstein’s theory, the deflection of light is predicted to be exactly as great as it is according to Newton’s theory
Which of the following waves has highest speed?
The spin of a photon is:
PMC 2021 Tested
Physics
Dawn of Modern Physics
Elimination Tool:
Light photons, each of energy 3.5 x 10-19J falls on the cathode of a photocell. The current through the cell is reduced to zero by taking the cathode to a potential +0.25 V relative to anode. The work function of the cathode is:
UHS 2018
Physics
Dawn of Modern Physics
Elimination Tool:
A Black body is?
What will the de Broglie wavelength of a 150 g mass moving with a velocity of 50 m/s be?
PMC 2021 Tested
Physics
Dawn of Modern Physics
Elimination Tool:
Minimum frequency below which no electrons are emitted from the metal surface is called ______ frequency.
NTS 2016 DUHS & JSMU
Physics
Dawn of Modern Physics
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The electron shows purely a ____ when free.
PMC Sample 2
Physics
Dawn of Modern Physics
Elimination Tool:
Fluorescence is produced when cathode rays strike on:
PMC 2021 Tested
Physics
Dawn of Modern Physics
Elimination Tool:
Plank׳s constant is analogus to:
PMC Sample 3
Physics
Dawn of Modern Physics
Elimination Tool:
When photons are incident on a metal, electrons are emitted. The process is called:
NTS 2016 SMBBMC
Physics
Dawn of Modern Physics
Elimination Tool:
Mass of a body with speed of light approaches to:
In E = aT4 E stands for??
Value of h Is:
Which behaves as a particle as well as wave
A photosensitive material would emit electrons if it is excited by a photon beyond a threshold. To cross the threshold, what should be increased?
PMC 2021 Tested
Physics
Dawn of Modern Physics
Elimination Tool:
Photocell is similar to:
PMC Sample 2
Physics
Dawn of Modern Physics
Elimination Tool:
Photoelectric effect is not produced by:
PMC 2021 Tested
Physics
Dawn of Modern Physics
Elimination Tool:
Name the scientist who won the noble prize for discovery of energy quanta
In photo-emission from a metal, if light of λ is replaced by light of wavelength λ / 4 , the maximum kinetic energy of the photoelectrons.
UHS 2018
Physics
Dawn of Modern Physics
Elimination Tool:
Calculate the energy of a photon, with a frequency of 3.0 x 1018 Hz.
(h = 6.63 x 10-34)
UHS 2019
Physics
Dawn of Modern Physics
Elimination Tool:
The stopping potential depends on
What would be Compton Wave shift if X-rays are scattered at an angle of 90 degree?
Electromagnetic wave theory was proposed by:
NTS 2015 SMBBMC
Physics
Dawn of Modern Physics
Elimination Tool:
Candela is the luminous intensity, in the perpendicular direction of a surface _________ square meter of a black body at the temperature of freezing platinum under a pressure of 101325 newtons per square meter.
NTS 2013
Physics
Dawn of Modern Physics
Elimination Tool:
Who was awarded Nobel Prize (1921) for explanation of Photoelectric Effect?
The energy of an X-ray quantum of wavelength 1.0 x 10-10 m is:
NTS 2012
Physics
Dawn of Modern Physics
Elimination Tool:
In Heisenberg Principle:
Debroglie wavelength for an electron and proton moving at same speed are L and 1; respectively. And frequencies are Fe and Fp respectively. Which of the following is corrract.