Question 1 :
Light of two different frequency whose photon have energies 1 eV and 2.5 eV respectively, successively illuminate a metal of work function 0.5eV. The ratio of maximum speed of the emitted electron will be:
Question 3 :
The threshold wavelength for emission of photoelectrons from a metal surface is $6 \times10^{-7}$m. The work function of the material of the metal surface is :<br/>
Question 4 :
The photoelectric threshold of a certain metal is $3000 A^o$. If the radiation of $2000 A^o$ is incident on the metal, then
Question 5 :
The number of photo electrons emitted for light of a frequency v (higher than the threshold frequency $v_0$) is proportional to :<br><br><br>
Question 6 :
If threshold wavelength for sodium is $6800\overset{o}{A}$ then the work function will be
Question 7 :
The minimum heat energy required to emit an electron from the surface of a metal is called _______.<br/>
Question 8 :
If the wavelength of the incident radiation changes from ${ \lambda }_{ 1 }$ to ${ \lambda }_{ 2 }$, then the maximum kinetic energy of the emitted photo electrons change from ${ K }_{ 1 }$ to ${ K }_{ 2 }$, then the work function of the emitter surface is
Question 9 :
Two photons, each of energy 2.5 eV are simultaneously incident on the metal surface. If the work function of the metal is 4.5 eV, then from the surface of the metal<br>
Question 10 :
The surface of a metal is illuminated with the light of $400nm$. The kinetic energy of the ejected photo-electrons was found to be $1.68eV$. The work function of the metal is ($hc=1240eV$) :
Question 12 :
The photo-electrons emitted from a surface of sodium metal are such that
Question 13 :
In a photoelectric experiment, if the potential difference across the electrodes is equal to the stopping potential and the emitter plate is held at negative potential with respect to the collector plate mark the correct statement :<br>
Question 14 :
If the wavelength $\lambda _{1}$ is allowed to fall on metal, then kinetic energy of photoelectrons emitted is $E_{1}$. If wavelength of light changes to $\lambda _{2}$ then kinetic energy of electrons also changes to $E_{2}$. Then work function of the metal is
