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

A microscopic particle of mass $$10^{-12}$$ kg is moving with a velocity of $$10^{2}$$ m/s. Then the de-Broglie wavelength associated with the particle is
  • $$6.6\times 10^{-24}m$$
  • $$6.6\times 10^{34}m$$
  • $$3.3\times 10^{24}m$$
  • $$0$$
The momentum of a photon of frequency v is
  • $$\dfrac{hv}{c}$$
  • $$hvc$$
  • $$\dfrac{h}{cv}$$
  • $$\dfrac{v}{ch}$$
The momentum of a photon of wavelength 0.01 $$A^{0}$$ is
  • $$6.6\times 10^{-32}kg$$ m/s
  • $$6.6\times 10^{-20}kg$$ m/s
  • $$6.6\times 10^{-22}kg$$ m/s
  • $$6.6\times 10^{-12}kg$$ m/s
An electron accelerated under a p.d. of V volt has a certain wavelength $$\lambda$$ . Mass of the proton is 2000 times the mass of an electron. If the proton has to have the same wavelength $$\lambda$$ , then it will have to be accelerated under p.d. of (volts):
  • $$100$$
  • $$2000$$
  • $$V/2000$$
  • $$\sqrt{2000}$$
The value of de Broglie wavelength of an electron moving with a speed of $$6.6 \times 10^{5} ms^{-1}$$ is approximately
  • 11 $$A^{0}$$
  • 111$$A^{0}$$
  • 211 $$A^{0}$$
  • 311 $$A^{0}$$
The de Broglie wavelength associated with a particle at rest is
  • 0
  • $$\infty $$
  • finite
  • data insufficient
Light of wavelength $$5000\overset { 0 }{ A } $$ is incident on a sensitive surface. If the surface has received  $${ 10 }^{ -7 }J$$ of energy, then number of photon just falling on the surface are
  • $$2.5\times 10^6$$
  • $$5\times 10^6$$
  • $$2.5\times{ 10 }^{ 11 }$$
  • $$5\times{ 10 }^{ 11 }$$
Energy of a photon of light of wavelength 450 nm is
  • $$4.4\times 10^{-19}J$$
  • $$2.5\times 10^{-19}J$$
  • $$1.25\times 10^{-17}J$$
  • $$2.5\times 10^{-17}J$$
Two different sources of light A and B have wavelength $$0.7\mu m$$ and $$0.3\mu m$$ 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 $$\lambda$$ = 2000 A$$^{o}$$ to that of $$\lambda$$ = 4000 A$$^{o}$$ 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
  • $$8\times 10^{-15}Hz$$
  • $$12\times 10^{-15}Hz$$
  • $$16\times 10^{15}Hz$$
  • 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
  • $$3\times 10^{7} Hz$$
  • $$3.3\times 10^{8} Hz$$
  • $$3\times 10^{9} Hz$$
  • $$3\times 10^{-7} Hz$$
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 $$\lambda$$ 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
  • $$\lambda_{ph} > \lambda_e$$
  • $$\lambda_{ph} < \lambda_e$$
  • $$\lambda_{ph} = \lambda_e$$
  • $$\frac{\lambda_e}{\lambda_{ph}}=constant$$
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 
  • $$1.8 \times 10^{-6} \, J$$
  • $$19.86 \times 10^{-17} \, J$$
  • $$16.82 \times 10^{-19} \, J$$
  • $$22.3 \times 10^{-9} \, J$$
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
  • $$\dfrac {h}{\sqrt {3mKT}}$$
  • $$\dfrac {h}{mKT}$$
  • $$\dfrac {\sqrt {2mKT}}{h}$$
  • $$\sqrt {2mKT}$$
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 $$m_0$$ and moving with speed of light in vacuum is ___________.
  • $$\dfrac{h}{m_0c}$$
  • $$0$$
  • $$\infty$$
  • $$\dfrac{m_0c}{h}$$
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 $$10 g$$ of calcium
carbonate is $$(N_A = 6.023 \times 10^{23})$$
  • (a)$$12.04 \times 10^{24}$$
  • (b)$$4.06 \times 10^{24}$$
  • (c)$$2.01 \times 10^{24}$$
  • (d)$$3.24 \times 10^{24}$$
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 $$\lambda =150\ nm$$ to that with $$\lambda =300\ nm$$ is
  • $$2$$
  • $$1/4$$
  • $$4$$
  • $$1/2$$
Energy of photon whose frequency is $$10^{12}MHz$$, will be
  • $$4.14\times 10^{3}keV$$
  • $$4.14\times 10^{2}keV$$
  • $$4.14\times 10^{3}MeV$$
  • $$4.14\times 10^{3}eV$$
Photon and electron are given energy $$\left( {{{10}^{ - 2}}J} \right).$$ Wavelengths associated with photon and electeon are $${\lambda _{ph}}$$ and $${\lambda _{el}},$$ then correct statement will be
  • $${\lambda _{ph}} > {\lambda _{el}}$$
  • $${\lambda _{ph}} < {\lambda _{el}}$$
  • $${\lambda _{ph}} = {\lambda _{el}}$$
  • $$\dfrac{{{\lambda _{el}}}}{{{\lambda _{ph}}}} = c$$
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
  • $$3 : 2$$
  • $$1 : 1$$
  • $$1 : 3$$
  • $$\sqrt{2} : 1$$
0:0:1


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