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CBSE Questions for Class 12 Medical Physics Dual Nature Of Radiation And Matter Quiz 2 - MCQExams.com

A microscopic particle of mass 1012 kg is moving with a velocity of 102 m/s. Then the de-Broglie wavelength associated with the particle is
  • 6.6×1024m
  • 6.6×1034m
  • 3.3×1024m
  • 0
The momentum of a photon of frequency v is
  • hvc
  • hvc
  • hcv
  • vch
The momentum of a photon of wavelength 0.01 A0 is
  • 6.6×1032kg m/s
  • 6.6×1020kg m/s
  • 6.6×1022kg m/s
  • 6.6×1012kg m/s
An electron accelerated under a p.d. of V volt has a certain wavelength λ . Mass of the proton is 2000 times the mass of an electron. If the proton has to have the same wavelength λ , then it will have to be accelerated under p.d. of (volts):
  • 100
  • 2000
  • V/2000
  • 2000
The value of de Broglie wavelength of an electron moving with a speed of 6.6×105ms1 is approximately
  • 11 A0
  • 111A0
  • 211 A0
  • 311 A0
The de Broglie wavelength associated with a particle at rest is
  • 0
  • finite
  • data insufficient
Light of wavelength 50000A is incident on a sensitive surface. If the surface has received  107J of energy, then number of photon just falling on the surface are
  • 2.5×106
  • 5×106
  • 2.5×1011
  • 5×1011
Energy of a photon of light of wavelength 450 nm is
  • 4.4×1019J
  • 2.5×1019J
  • 1.25×1017J
  • 2.5×1017J
Two different sources of light A and B have wavelength 0.7μm and 0.3μm respectively. Then which of the following statement is true.
  • A has greater energy than B
  • B has greater energy than A
  • Both has equal energy
  • None of the above
The ratio of energy of photon of λ = 2000 Ao to that of λ = 4000 Ao is :
  • 2
  • 1/4
  • 4
  • 1/2
For the same kinetic energy, the momentum shall be minimum for
  • Electron
  • Proton
  • Neutron
  • Alpha particle
Frequency of a photon having energy 66 eV is
  • 8×1015Hz
  • 12×1015Hz
  • 16×1015Hz
  • None of these
A device for producing intense and coherent (waves in step) beam of light is called a:
  • laser
  • maser
  • search light
  • radar
Louis de -Broglie is credited for his work on 
  • Theory of relativity
  • Electromagnetic theory
  • Matter waves
  • Law of distribution of velocities
When light falls on certain materials, electrons are released. These electrons are called :
  • extra electrons
  • valency electrons
  • free electrons
  • photoelectrons
Einstein got his Nobel Prize for 
  • His theory of relativity
  • Explanation of Photoelectric effect
  • His theory of atomic heats of solids
  • None of the above
A photon of light from which of the following electromagnetic radiations carries the greater amount of energy?
  • Blue
  • Green
  • Orange
  • Red
  • Yellow
The frequency of radio waves corresponding to a wavelength of 10 m is
  • 3×107Hz
  • 3.3×108Hz
  • 3×109Hz
  • 3×107Hz
The emission of photon without using an external agency for its emission in a system is called __________.
  • light amplification
  • induced absorption
  • stimulated emission
  • spontaneous emission
The de-Broglie wavelength λ of a particle 
  • is proportional to mass.
  • is proportional to impulse.
  • is inversely proportional to impulse.
  • does not depend on impulse.
LASER beams are used to measure long distances because
  • they are monochromatic.
  • they are coherent.
  • they are highly polarised.
  • they have high degree of parallelism.
When is the energy received from the photon maximum, if a photon strikes an electron?
  • The electron does not spin when it is struck
  • The photon has a high velocity
  • The photon has a low velocity
  • The photon has a long wavelength
  • The photon has a high frequency
The de-Broglie wavelength of electron in second Bohr's orbit is equal to ____________.
  • circumference of the orbit
  • half the circumference of the orbit
  • twice the circumference of the orbit
  • four times circumference of the orbit
Which of the following statements about photon is incorrect?
  • Photon exerts no pressure
  • Rest mass of photon is zero
  • None of these
  • Energy of photon is hv
When light falls on certain materials, electrons are released.These electrons are called :
  • Extra electrons
  • Valency electrons
  • Free electrons
  • Photoelectrons
According to de Broglie, Which of the following statements is true about the wavelength of a moving particle?
  • It is never large enough to measure.
  • It is proportional to the speed of the particle.
  • It is inversely proportional to the momentum of the particle.
  • It is equal to Planck's constant
  • It has no effect on the behavior of electrons.
Identify which of the above graph best describe the relationship between the energy of the photon and its wavelength ?
480426_3ee6077ebc454131b2c45ac8e4b9df12.png
  • Graph A
  • Graph B
  • Graph C
  • Graph D
  • Graph E
Relation between wavelength of photon and electron of same energy is
  • λph>λe
  • λph<λe
  • λph=λe
  • λeλph=constant
Which of the following graphs represents the energy of a photon vs. its frequency?
Identify the electromagnetic wave whose photons has the highest energy .
  • X-ray
  • ultraviolet light
  • green light
  • microwave
  • radio wave
Identify the reason why an observer cannot detect the wave nature of a fast moving truck .
  • The momentum of the truck is too large
  • The velocity of the wave is too large
  • There are no waves to be detected
  • The frequency is too low
  • The wavelengths are too small
An electron has a wavelength of 1 nm. Then, the kinetic energy of the electron is 
  • 1.8×106J
  • 19.86×1017J
  • 16.82×1019J
  • 22.3×109J
A laser beam is used for carrying out surgery because it
  • Is highly coherent
  • Is highly directional
  • Can be sharply focussed
  • Is highly monochromatic
Max K.E of photo electrons depend upon light's
  • intensity
  • frequency
  • wavelength
  • all of these
The energy of a photon varies directly with its
  • frequency
  • wavelength
  • speed
  • rest mass
The de-Broglie wavelength associated with thermal neutron ( t=51C say) is of the order of the 
  • distance between the atoms in the crystal
  • size of the nucleus
  • Bohr's radius
  • size of grain
If the wave properties of a particle are difficult to observe, it is probably due to the particle's
  • small size
  • large mass
  • low momentum
  • high charge
De-Broglie wavelength of an atom at absolute temperature T K will be
  • h3mKT
  • hmKT
  • 2mKTh
  • 2mKT
Which color of light has the greatest energy per photon?
  • blue
  • green
  • violet
  • red
The work function of Na metal is 2.3 eV, then the threshold wavelength lies in the following region of EM spectrum
  • ultraviolet
  • X-ray
  • violet
  • yellow
If the mass of a microscopic particle a well as its speed are halved, the de-broglie wavelength associated with the particle will
  • increased by a factor more than 2
  • increases by a factor of 2
  • decreases by a factor of 2
  • decrease by a factor more than 2
If a proton and electron have the same de-Broglie wavelength, then 
  • Kinetic energy of electron < kinetic energy of proton
  • Kinetic energy of electron = kinetic energy of proton
  • Momentum of electron > momentum of proton
  • Momentum of electron = momentum of proton
  • Momentum of electron < momentum of proton
The de-Broglie wavelength associated with a particle with rest mass m0 and moving with speed of light in vacuum is ___________.
  • hm0c
  • 0
  • m0ch
The energy of a photon corresponding to the visible light of maximum wavelength is approximately 
  • 1 eV
  • 1.6 eV
  • 3.2 eV
  • 7 eV
 Total number of protons in 10g of calcium
carbonate is (NA=6.023×1023)
  • (a)12.04×1024
  • (b)4.06×1024
  • (c)2.01×1024
  • (d)3.24×1024
A proton is accelerated to 225V. Its de-Broglie wavelength is:
  • 0.0019nm
  • 0.02nm
  • 0.003nm
  • 0.4nm
The ratio of the energy of a photon with λ=150 nm to that with λ=300 nm is
  • 2
  • 1/4
  • 4
  • 1/2
Energy of photon whose frequency is 1012MHz, will be
  • 4.14×103keV
  • 4.14×102keV
  • 4.14×103MeV
  • 4.14×103eV
Photon and electron are given energy (102J). Wavelengths associated with photon and electeon are λph and λel, then correct statement will be
  • λph>λel
  • λph<λel
  • λph=λel
  • λelλph=c
A particle at rest decays into two particles of masses 2 m and 
3 m having non-zero velocities. The ratio of DE-Imbroglio wavelength of the particle is
  • 3:2
  • 1:1
  • 1:3
  • 2:1
0:0:3


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