Question 1 :
The curve drawn between velocity and frequency of photon in vacuum will be a
Question 2 :
An electron beam after collision with the targetproduces X-rays of wavelength $4 A^0$. The velocityof the electron beam is<br>
Question 3 :
The frequency of radio waves corresponding to a wavelength of $10\ m$ is
Question 4 :
The de-Broglie wavelength of an electron in the ground state of the hydrogen atom is :
Question 5 :
According to de Broglie, Which of the following statements is true about the wavelength of a moving particle?<br/>
Question 6 :
Identify the reason why an observer cannot detect the wave nature of a fast moving truck .
Question 7 :
Relation between wavelength of photon and electron of same energy is
Question 9 :
The de-Broglie wavelength associated with thermal neutron ( t=51C say) is of the order of the<br>
Question 10 :
De-Broglie wavelength of an atom at absolute temperature $T\ K$ will be
Question 11 :
For the Bohr's first orbit of circumference $2\pi r$, the de-Broglie wavelength of revolcing electron will be.
Question 12 :
The energy of a $K$-electron in tungsten is $-20keV$ and of an $L$-electrons is $-2keV$. The wavelength of X-rays emitted when there is electron jump from $L$ to $K$ shell:
Question 13 :
de-Broglie wavelength associated with an electron revolving in the $n^{th}$ state of hydrogen atom is directly proportional to
Question 15 :
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.
Question 16 :
A particle at rest decays into two particles of masses 2 m and <br/>3 m having non-zero velocities. The ratio of DE-Imbroglio wavelength of the particle is
Question 17 :
If a proton and electron have the same de-Broglie wavelength, then
Question 18 :
A particle of mass M at rest decays into particles of masses $m_{1} \ and  \ m_{2}$ having non -zero velocities. The ratio of the de broglie wavelengths of the particles $\lambda _{1}/\lambda _{2}$ is :
Question 19 :
If h is Plancks constant, the momentum of a photon of wavelength 0.01 $A^o$ is
Question 20 :
For the same kinetic energy, the momentum shall be minimum for
Question 21 :
What wavelength must electromagnetic radiation have if a photon in the beam has the same momentum as an electron moving with a speed $1.1\times 10^5$m/s(Planck's constant $=6.6\times 10^{-34}$J-s, rest mass of electron$=9\times 10^{-31}$kg?
Question 22 :
The de-Broglie wavelength associated with with the particle of mass $m$ moving with velocity $v$ is 
Question 23 :
If a photon has velocity $c$ and frequency $v$, then which of the following represents its wavelength
Question 27 :
Moving with the same velocity, one of the following has the longest de Broglie wavelength<br/>
Question 28 :
A microscopic particle of mass $10^{-12}$ kg is movingwith a velocity of $10^{2}$ m/s. Then the de-Brogliewavelength associated with the particle is<br>
Question 29 :
A proton when accelerated through a potential difference of  V volt has a wavelength $\lambda $ associated with it. An $\alpha  $ - particle in order to have the same wavelength $\lambda $ must be accelerated through a p.d. of<br/>
Question 31 :
The value of de Broglie wavelength of an electron moving with a speed of $6.6 \times 10^{5} ms^{-1}$ is approximately<br/>
Question 33 :
The wavelength associated with an electron having kinetic energy is given by the expression:<br/>
Question 34 :
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):<br/>
Question 36 :
The de-Broglie wavelength of electron in second Bohr's orbit is equal to ____________.
Question 37 :
Assertion: The de Broglie equation has significance for any microscopic or sub-microscopic particles.
Reason: The de Broglie wavelength is inversely proportional to the mass of the object if velocity is constant.
Question 38 :
De Broglie wavelength $\lambda$ associated with neutrons is related with absolute temperature T as:
Question 40 :
A particle of mass M at rest decays into two masses$\displaystyle { m }_{ 1 }$ and$\displaystyle { m }_{ 2 }$ with non zero velocities. The ratio of de-Broglie wavelengths of the particles$\displaystyle \frac { { \lambda }_{ 1 } }{ { \lambda }_{ 2 } }$ is:
Question 41 :
If the mass of a microscopic particle a well as its speed are halved, the de-broglie wavelength associated with the particle will
Question 42 :
The effective mass of photon in microwave region, visible region and x -ray region is in the following order:<br>
Question 43 :
The de-Broglie wavelength associated with a particle with rest mass $m_0$ and moving with speed of light in vacuum is ___________.
Question 45 :
By means of the diffraction experiment, it is determined that the electron's de Broglie wavelength is $6.6 \times {10}^{-10} m$. What is the electron's linear momentum? Use Planck's constant, $h = 6.6 \times {10}^{-34} J{A} s$.<br/>
Question 47 :
According to Heisenberg's uncertainty principle, which of the following statement is true ?<br/>
Question 49 :
Which of the following is the best definition of the uncertainty principle?
Question 50 :
Although we can know with great precision the pattern formed by huge numbers of photons passing through the lines on a diffraction grating, we cannot know at all where one single photon will go when it passes through the diffraction grating.<br>This statement describes the truth revealed by what theory?
Question 51 :
An electron (mass $m$) with initial velocity $\vec { v } ={ v }_{ 0 }\hat { i } +{ v }_{ 0 }\hat { j } $ is an electric field $\vec { E } =-{ E }_{ 0 }\hat { k } $. If ${ \lambda }_{ 0 }$ is initial de-Broglie wave length at time $t$ is given by
Question 52 :
The energy of a photons is equal to the kinetic energy of a proton. If $\lambda_1$ is the de-Broglie wavelength of a proton, $\lambda_2$ the wavelength associated with the photon, and if the energy of the photon is E, then $(\lambda_1/\lambda_2)$ is proportional to:
Question 53 :
The de Broglie wavelength of a molecule of thermal energy KT (K is Boltzmann constant and T is absolute temperature) is given by :<br/>
Question 54 :
When green light is made incident on a metal, photoelectrons are emitted by it but no photoelectrons are obtained by yellow light. If red light is made incident on that metal then
Question 55 :
A particle of mass 3m at rest decays into two particles of masses m and 2m having non-zero velocities. The ratio of the de Broglie wavelengths of the particles $(\lambda_1/\lambda_2)$ is<br>
Question 57 :
Assertion: The de-Broglie wavelength equation has significant for any microscopic and submicroscopic particles.
Reason: de-Broglie wavelength is inversely proportional tot he mass of the object, if its velocity is constant.
Question 58 :
A proton when accelerated through a potential difference of V volt has wavelength $\lambda$  associated with it .An electron to have the same $\lambda$  must be accelerated through a p.d of<br/>
Question 59 :
A narrow electron beam passes undeviated through an electric field $E=3\times 10^{4}\ volt/m$ and an overlapping magnetic field $B=2\times 10^{-3}\ Weber/m^{2}$. If electric field and magnetic field are mutually perpendicular. The speed of the electrons is
Question 60 :
A surface has work function 3.3 $eV$ . Which of the following will cause emission?<br>
