142328
Light rays of wavelengths $6000 \AA$ and photon intensity $39.6 \mathrm{watt} / \mathrm{m}^{2}$ is incident on a metal surface. If only one percent of photons incident on the surfaced emit photoelectron, then the number of electrons emitted per second per unit area from the surface will be:
(Planck constant $=6.64 \times 10^{-34} \mathrm{~J}-\mathrm{s}$, velocity of light $=3 \times 10^{-8} \mathrm{~m} / \mathrm{s}$ )
142329 The work functions of the metals $A$ and $B$ are in the ratio $1: 2$. If the light of frequencies $f$ and $2 f$ are incident on metal surfaces of $A$ and $B$ respectively. The ratio of maximum kinetic energy of photo electrons emitted is [ $f$ is greater than threshold frequency of $A$. $2 f$ is greater than threshold frequency of $B$ ]:
142331 Photons of energy $2.0 \mathrm{eV}$ and wavelength $\lambda$ fall on a metal plate and release photoctrons with a maximum velocity v. By decreasing $\lambda$ by $25 \%$ the maximum velocity of photoelectrons is doubled. The work function of the material of the metal plate in $\mathrm{eV}$ is
142328
Light rays of wavelengths $6000 \AA$ and photon intensity $39.6 \mathrm{watt} / \mathrm{m}^{2}$ is incident on a metal surface. If only one percent of photons incident on the surfaced emit photoelectron, then the number of electrons emitted per second per unit area from the surface will be:
(Planck constant $=6.64 \times 10^{-34} \mathrm{~J}-\mathrm{s}$, velocity of light $=3 \times 10^{-8} \mathrm{~m} / \mathrm{s}$ )
142329 The work functions of the metals $A$ and $B$ are in the ratio $1: 2$. If the light of frequencies $f$ and $2 f$ are incident on metal surfaces of $A$ and $B$ respectively. The ratio of maximum kinetic energy of photo electrons emitted is [ $f$ is greater than threshold frequency of $A$. $2 f$ is greater than threshold frequency of $B$ ]:
142331 Photons of energy $2.0 \mathrm{eV}$ and wavelength $\lambda$ fall on a metal plate and release photoctrons with a maximum velocity v. By decreasing $\lambda$ by $25 \%$ the maximum velocity of photoelectrons is doubled. The work function of the material of the metal plate in $\mathrm{eV}$ is
142328
Light rays of wavelengths $6000 \AA$ and photon intensity $39.6 \mathrm{watt} / \mathrm{m}^{2}$ is incident on a metal surface. If only one percent of photons incident on the surfaced emit photoelectron, then the number of electrons emitted per second per unit area from the surface will be:
(Planck constant $=6.64 \times 10^{-34} \mathrm{~J}-\mathrm{s}$, velocity of light $=3 \times 10^{-8} \mathrm{~m} / \mathrm{s}$ )
142329 The work functions of the metals $A$ and $B$ are in the ratio $1: 2$. If the light of frequencies $f$ and $2 f$ are incident on metal surfaces of $A$ and $B$ respectively. The ratio of maximum kinetic energy of photo electrons emitted is [ $f$ is greater than threshold frequency of $A$. $2 f$ is greater than threshold frequency of $B$ ]:
142331 Photons of energy $2.0 \mathrm{eV}$ and wavelength $\lambda$ fall on a metal plate and release photoctrons with a maximum velocity v. By decreasing $\lambda$ by $25 \%$ the maximum velocity of photoelectrons is doubled. The work function of the material of the metal plate in $\mathrm{eV}$ is
142328
Light rays of wavelengths $6000 \AA$ and photon intensity $39.6 \mathrm{watt} / \mathrm{m}^{2}$ is incident on a metal surface. If only one percent of photons incident on the surfaced emit photoelectron, then the number of electrons emitted per second per unit area from the surface will be:
(Planck constant $=6.64 \times 10^{-34} \mathrm{~J}-\mathrm{s}$, velocity of light $=3 \times 10^{-8} \mathrm{~m} / \mathrm{s}$ )
142329 The work functions of the metals $A$ and $B$ are in the ratio $1: 2$. If the light of frequencies $f$ and $2 f$ are incident on metal surfaces of $A$ and $B$ respectively. The ratio of maximum kinetic energy of photo electrons emitted is [ $f$ is greater than threshold frequency of $A$. $2 f$ is greater than threshold frequency of $B$ ]:
142331 Photons of energy $2.0 \mathrm{eV}$ and wavelength $\lambda$ fall on a metal plate and release photoctrons with a maximum velocity v. By decreasing $\lambda$ by $25 \%$ the maximum velocity of photoelectrons is doubled. The work function of the material of the metal plate in $\mathrm{eV}$ is
142328
Light rays of wavelengths $6000 \AA$ and photon intensity $39.6 \mathrm{watt} / \mathrm{m}^{2}$ is incident on a metal surface. If only one percent of photons incident on the surfaced emit photoelectron, then the number of electrons emitted per second per unit area from the surface will be:
(Planck constant $=6.64 \times 10^{-34} \mathrm{~J}-\mathrm{s}$, velocity of light $=3 \times 10^{-8} \mathrm{~m} / \mathrm{s}$ )
142329 The work functions of the metals $A$ and $B$ are in the ratio $1: 2$. If the light of frequencies $f$ and $2 f$ are incident on metal surfaces of $A$ and $B$ respectively. The ratio of maximum kinetic energy of photo electrons emitted is [ $f$ is greater than threshold frequency of $A$. $2 f$ is greater than threshold frequency of $B$ ]:
142331 Photons of energy $2.0 \mathrm{eV}$ and wavelength $\lambda$ fall on a metal plate and release photoctrons with a maximum velocity v. By decreasing $\lambda$ by $25 \%$ the maximum velocity of photoelectrons is doubled. The work function of the material of the metal plate in $\mathrm{eV}$ is