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If frequency of incident light is increased beyond threshold frequency, keeping light intensity constant, then:
NUMS 2019 Reconduct
Physics
Dawn of Modern Physics
Elimination Tool:
Anti matter theory was proposed by: a) Einstein b) Bohr
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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Who proposed matter waves?
The concept of work function was given by:
PMC Sample 2
Physics
Dawn of Modern Physics
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Which of the following waves has highest speed?
Compton shift is maximum at:
PMC 2021 Tested
Physics
Dawn of Modern Physics
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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
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The existence of positron was discovered in the:
PMC Sample 3
Physics
Dawn of Modern Physics
Elimination Tool:
theory of was Relativity proposed by
The photocell is similar to:
PMC Practice 5
Physics
Dawn of Modern Physics
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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
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The electron shows purely a ____ when free.
PMC Sample 2
Physics
Dawn of Modern Physics
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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:
Value of h Is:
Who was awarded Nobel Prize (1921) for explanation of Photoelectric Effect?
What will be the energy of electron travelling at 10^7 m/s
Earth is a/an frame of reference
Minimum frequency below which no electrons are emitted from the metal surface is called ______ frequency.
NTS 2016 DUHS & JSMU
Physics
Dawn of Modern Physics
Elimination Tool:
White light gives spectrum after undergoing:
PMC Sample 2
Physics
Dawn of Modern Physics
Elimination Tool:
In E = aT4 E stands for??
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:
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:
Calculate the energy of a photon of wavelength 6600 Angstroms:
PMC Practice 5
Physics
Dawn of Modern Physics
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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
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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.
Name the scientist who won the noble prize for discovery of energy quanta
What would be Compton Wave shift if X-rays are scattered at an angle of 90 degree?
Planck’s constant is analogous to:
PMC Practice 6
Physics
Dawn of Modern Physics
Elimination Tool:
The stopping potential depends on
Minimum energy required to eject an electron from metal surface is called:
UHS 2019
Physics
Dawn of Modern Physics
Elimination Tool:
Which light photon has the least momentum?
PMC Practice 6
Physics
Dawn of Modern Physics
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Heisenberg uncertainty principle states:
The charge of a photon is:
PMC Sample 1
Physics
Dawn of Modern Physics
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Which behaves as a particle as well as wave
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
Elimination Tool:
Which of following has greatest energy
Which group consists of only electromagnetic waves?
PMC Sample 1
Physics
Dawn of Modern Physics
Elimination Tool:
In Heisenberg Principle:
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:
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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Einstein was given a Nobel prize for:
PMC 2021 Tested
Physics
Dawn of Modern Physics
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X-rays are used to investigate:
PMC Sample 3
Physics
Dawn of Modern Physics
Elimination Tool:
Photocell is similar to:
PMC Sample 2
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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Black body radiations were first observed by:
A Black body is?
Photoelectric effect is not produced by:
PMC 2021 Tested
Physics
Dawn of Modern Physics
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The spin of a photon is:
PMC 2021 Tested
Physics
Dawn of Modern Physics
Elimination Tool:
) Twin paradox Is consequence of?
When photons are incident on a metal, electrons are emitted. The process is called:
NTS 2016 SMBBMC
Physics
Dawn of Modern Physics
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Plank׳s constant is analogus to:
PMC Sample 3
Physics
Dawn of Modern Physics
Elimination Tool:
If Compton shift is half of Compton wavelength, then the scattering angle would be:
Gamma rays cause photoelectric emission when their energy is
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:
Who was awarded Nobel Prize (1921) for explanation of Photoelectric Effect?
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:
Mass of a body with speed of light approaches to:
Which statement is universally correct?
Black body emits which of the following radiations:
In order to produce pair production the minimum energy of photon required is:
NTS 2019
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:
Momentum of a photon is?
PMC Practice 2
Physics
Dawn of Modern Physics
Elimination Tool:
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:
Which of the following color has maximum energy?
Scattering of photon by electron is termed as:
In Compton’s effect the wavelength of the scattered photon is
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:
Sunlight will emit photo electrons when striking which of the following
The absolute standard of rest is:
The uncertainty in momentum and position is due to its:
PMC Sample 1
Physics
Dawn of Modern Physics
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Presence of Photon was confirmed by
Value of Wien’s constant is?
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
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:
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
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The number of LED segments used in a calculator display:
NUMS 2015
Physics
Dawn of Modern Physics
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Physics is an experimental science which depends heavily on:
NTS 2016 SMBBMC
Physics
Dawn of Modern Physics
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The maximum Compton shift Is at
Electromagnetic wave theory was proposed by:
NTS 2015 SMBBMC
Physics
Dawn of Modern Physics
Elimination Tool:
If temperature on Kelvin scale Is reduced to half, what would be the effect on the energy of radiations?
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:
Which of the following Is correct?
In Einstein’s theory, the deflection of light is predicted to be exactly as great as it is according to Newton’s theory
According to Einstein, bodies and light rays follow a:
NUMS 2015
Physics
Dawn of Modern Physics
Elimination Tool:
The energy equivalent to 0.9 mg is? a) 9 x 1091 b) 8.1 x 10″J •
Fluorescence is produced when cathode rays strike on:
PMC 2021 Tested
Physics
Dawn of Modern Physics
Elimination Tool: