142174 Two streams of photons, possessing energies to five and ten times the work function of metal are incident on the metal surface successively. The ratio of the maximum velocities of the photoelectron emitted, in the two cases respectively, will be

142175 For a specific wavelength $670 \mathrm{~nm}$ of light coming from a galaxy moving with velocity $v$, the observed wavelength is $670.7 \mathrm{~nm}$. The value of $v$ is:

142176 The light of two different frequencies whose photons have energies $3.8 \mathrm{eV}$ and $1.4 \mathrm{eV}$ respectively, illuminate a metallic surface whose work function is $0.6 \mathrm{eV}$ successively. The ratio of maximum speeds of emitted electrons for the two frequencies respectively will be.

142177 A metal exposed to light of wavelength $800 \mathrm{~nm}$ and emits photoelectrons with a certain kinetic energy. The maximum kinetic energy of photoelectron doubles when light of wavelength 500 $\mathrm{nm}$ is used. The work function of the metal is (Take hc $=1230 \mathrm{eV}-\mathrm{m})$.

142174 Two streams of photons, possessing energies to five and ten times the work function of metal are incident on the metal surface successively. The ratio of the maximum velocities of the photoelectron emitted, in the two cases respectively, will be

142175 For a specific wavelength $670 \mathrm{~nm}$ of light coming from a galaxy moving with velocity $v$, the observed wavelength is $670.7 \mathrm{~nm}$. The value of $v$ is:

142176 The light of two different frequencies whose photons have energies $3.8 \mathrm{eV}$ and $1.4 \mathrm{eV}$ respectively, illuminate a metallic surface whose work function is $0.6 \mathrm{eV}$ successively. The ratio of maximum speeds of emitted electrons for the two frequencies respectively will be.

142177 A metal exposed to light of wavelength $800 \mathrm{~nm}$ and emits photoelectrons with a certain kinetic energy. The maximum kinetic energy of photoelectron doubles when light of wavelength 500 $\mathrm{nm}$ is used. The work function of the metal is (Take hc $=1230 \mathrm{eV}-\mathrm{m})$.

142174 Two streams of photons, possessing energies to five and ten times the work function of metal are incident on the metal surface successively. The ratio of the maximum velocities of the photoelectron emitted, in the two cases respectively, will be

142175 For a specific wavelength $670 \mathrm{~nm}$ of light coming from a galaxy moving with velocity $v$, the observed wavelength is $670.7 \mathrm{~nm}$. The value of $v$ is:

142176 The light of two different frequencies whose photons have energies $3.8 \mathrm{eV}$ and $1.4 \mathrm{eV}$ respectively, illuminate a metallic surface whose work function is $0.6 \mathrm{eV}$ successively. The ratio of maximum speeds of emitted electrons for the two frequencies respectively will be.

142177 A metal exposed to light of wavelength $800 \mathrm{~nm}$ and emits photoelectrons with a certain kinetic energy. The maximum kinetic energy of photoelectron doubles when light of wavelength 500 $\mathrm{nm}$ is used. The work function of the metal is (Take hc $=1230 \mathrm{eV}-\mathrm{m})$.

142174 Two streams of photons, possessing energies to five and ten times the work function of metal are incident on the metal surface successively. The ratio of the maximum velocities of the photoelectron emitted, in the two cases respectively, will be

142175 For a specific wavelength $670 \mathrm{~nm}$ of light coming from a galaxy moving with velocity $v$, the observed wavelength is $670.7 \mathrm{~nm}$. The value of $v$ is:

142176 The light of two different frequencies whose photons have energies $3.8 \mathrm{eV}$ and $1.4 \mathrm{eV}$ respectively, illuminate a metallic surface whose work function is $0.6 \mathrm{eV}$ successively. The ratio of maximum speeds of emitted electrons for the two frequencies respectively will be.

142177 A metal exposed to light of wavelength $800 \mathrm{~nm}$ and emits photoelectrons with a certain kinetic energy. The maximum kinetic energy of photoelectron doubles when light of wavelength 500 $\mathrm{nm}$ is used. The work function of the metal is (Take hc $=1230 \mathrm{eV}-\mathrm{m})$.