Question 1 :
The de-Broglie wavelength of electron in second Bohr's orbit is equal to ____________.
Question 2 :
The de-Broglie wavelength associated with with the particle of mass $m$ moving with velocity $v$ is 
Question 3 :
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 4 :
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 5 :
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 6 :
If h is Plancks constant, the momentum of a photon of wavelength 0.01 $A^o$ is
Question 7 :
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 9 :
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 12 :
According to Heisenberg's uncertainty principle, which of the following statement is true ?<br/>
Question 13 :
The de-Broglie wavelength associated with a particle with rest mass $m_0$ and moving with speed of light in vacuum is ___________.
Question 17 :
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 18 :
For the Bohr's first orbit of circumference $2\pi r$, the de-Broglie wavelength of revolcing electron will be.
Question 19 :
De Broglie wavelength $\lambda$ associated with neutrons is related with absolute temperature T as:
Question 21 :
An electron and a proton are accelerated through the same potential difference. The ratio of their de Broglie wavelengths ($\dfrac{\lambda_{e}}{\lambda_{p}}$ ) is<br/>
Question 22 :
The photo cut-off voltage in an experiment was found to be $1.5 V$. The work function for the material used in the experiment was $4.2$ $2V$. The maximum kinetic energy for the photo electrons that was emitted was
Question 23 :
You are given an electron with a deBroglie wavelength of $\lambda =76.3$ nm. What is the Kelvin temperature of this electron ?
Question 24 :
A beam of light is strikes on a piece of metal whose work function is 6.0 eV. Calculate the maximum kinetic energy of photoelectrons ejected from the metals surface if frequency of light is $7.2\times 10^{15}Hz$.
Question 25 :
A particle $A$ of mass $m$ and initial velocity $v$ collides with a particle $B$ of mass $\dfrac{m}{2}$ which is at rest. The collision is head on, and elastic. The ratio of the de-Broglie wavelengths ${\lambda}_A$ to ${\lambda}_B$ after the collision is :
Question 26 :
Let $p$ and $E$ denote the linear momentum and the energy of a photon. For another photon of smaller wavelength (in same medium)
Question 27 :
The maximum energy of electrons released in a photo-cell is independent of
Question 28 :
In photo-electric effect, when photons of energy $'hv\ '$ are incident on a metal surface, electrons are emitted with some kinetic energy. It is possible to say that<br/>
Question 30 :
Which of the following properties of light conclusively support to wave theory of light?
Question 31 :
A particle moving with kinetic energy E has de Broglie wavelength $\lambda$. If energy $\Delta E$ is added to its energy, the wavelength become $\lambda /2$. Value of $\Delta E$, is?
Question 33 :
An electron of mass 'm' has de-Broglie wavelength '$\lambda$' when accelerated through potential difference 'V'. When proton of mass 'M', is accelerated through potential difference $9V$, the de-Broglie wavelength associated with it will be : (Assume that wavelength is determined at low voltage)
Question 34 :
All electrons ejected from a surface by incident light of wavelength $200$ nm can be stopped before traveling 1m in the direction of a uniform electric field of $4N/C$. The work function of the surface is
Question 35 :
In Millikan's oil drop experiment an oil drop carrying a charge $Q$ is held stationary by a potential difference $2400V$ between the plates. To keep a drop of half the radius stationary the potential difference had to be made $600V$. What is the charge on the second drop:
Question 36 : <p>Representing the stopping potential V along the y-axis and $\dfrac{1}{\lambda}$ along the x-axis for a given<br/>photocathode, the curve is a  straight line, the intercept on the y-axis is equal to</p>
Question 38 :
De Broglie wavelength of neutrons in thermal equilibrium is (given $m_n=1.6\times 10^{-27} kg)$<br>
Question 39 :
The de-Broglie wavelength of an electron is the same as that of a $50 keV$ X-ray photon. The ratio of the energy of the photon to the kinetic energy of the electron is (the energy equivalent of electron mass is $0.5 MeV$):
Question 40 :
Two sources A and B have same power. The wavelength of radiation of A is $\lambda_{a}$ and that of B is $\lambda_{b}$. The number of photons emitted per second by A and B are $n_{a}$ & $n_{b}$ respectively, then,<br/>
