141978 The average number of photons emitted per second by a laser of power $6.6 \times 10^{-3} \mathrm{~W}$ producing a light of wavelength $600 \mathrm{~nm}$ is (Planck's constant, $h=6.6 \times 10^{-34} \mathrm{~J} \mathrm{~s}$ )

141979 A metal has work function $2.5 \mathrm{eV}$. If a radiation of frequency $3.2 \times 10^{15} \mathrm{~Hz}$ is incident on this metal surface, then the maximum kinetic energy of ejected photo electrons is(Plank's constant, $\mathrm{h}=\mathbf{6 . 6} \times \mathbf{1 0}^{-34} \mathrm{~J}-\mathrm{s}$ )

141980 The photoemission of electrons occur when a light of frequency $5 \times 10^{14} \mathrm{~Hz}$ is incident on a metal surface with work function of $2.0 \mathrm{eV}$. The maximum speed of emitted photoelectrons is approximately
(Planck's constant $=6.6 \times 10^{-34} \mathrm{Js}$, mass of electron $=9 \times 10^{-31} \mathrm{~kg}$ )

141982 A light of intensity $12 \mathrm{Wm}^{-2}$ incidents on a black surface of area $4 \mathrm{~cm}^{2}$. The radiation pressure on the surface is

141978 The average number of photons emitted per second by a laser of power $6.6 \times 10^{-3} \mathrm{~W}$ producing a light of wavelength $600 \mathrm{~nm}$ is (Planck's constant, $h=6.6 \times 10^{-34} \mathrm{~J} \mathrm{~s}$ )

141979 A metal has work function $2.5 \mathrm{eV}$. If a radiation of frequency $3.2 \times 10^{15} \mathrm{~Hz}$ is incident on this metal surface, then the maximum kinetic energy of ejected photo electrons is(Plank's constant, $\mathrm{h}=\mathbf{6 . 6} \times \mathbf{1 0}^{-34} \mathrm{~J}-\mathrm{s}$ )

141980 The photoemission of electrons occur when a light of frequency $5 \times 10^{14} \mathrm{~Hz}$ is incident on a metal surface with work function of $2.0 \mathrm{eV}$. The maximum speed of emitted photoelectrons is approximately
(Planck's constant $=6.6 \times 10^{-34} \mathrm{Js}$, mass of electron $=9 \times 10^{-31} \mathrm{~kg}$ )

141982 A light of intensity $12 \mathrm{Wm}^{-2}$ incidents on a black surface of area $4 \mathrm{~cm}^{2}$. The radiation pressure on the surface is

141978 The average number of photons emitted per second by a laser of power $6.6 \times 10^{-3} \mathrm{~W}$ producing a light of wavelength $600 \mathrm{~nm}$ is (Planck's constant, $h=6.6 \times 10^{-34} \mathrm{~J} \mathrm{~s}$ )

141979 A metal has work function $2.5 \mathrm{eV}$. If a radiation of frequency $3.2 \times 10^{15} \mathrm{~Hz}$ is incident on this metal surface, then the maximum kinetic energy of ejected photo electrons is(Plank's constant, $\mathrm{h}=\mathbf{6 . 6} \times \mathbf{1 0}^{-34} \mathrm{~J}-\mathrm{s}$ )

141980 The photoemission of electrons occur when a light of frequency $5 \times 10^{14} \mathrm{~Hz}$ is incident on a metal surface with work function of $2.0 \mathrm{eV}$. The maximum speed of emitted photoelectrons is approximately
(Planck's constant $=6.6 \times 10^{-34} \mathrm{Js}$, mass of electron $=9 \times 10^{-31} \mathrm{~kg}$ )

141982 A light of intensity $12 \mathrm{Wm}^{-2}$ incidents on a black surface of area $4 \mathrm{~cm}^{2}$. The radiation pressure on the surface is

141978 The average number of photons emitted per second by a laser of power $6.6 \times 10^{-3} \mathrm{~W}$ producing a light of wavelength $600 \mathrm{~nm}$ is (Planck's constant, $h=6.6 \times 10^{-34} \mathrm{~J} \mathrm{~s}$ )

141979 A metal has work function $2.5 \mathrm{eV}$. If a radiation of frequency $3.2 \times 10^{15} \mathrm{~Hz}$ is incident on this metal surface, then the maximum kinetic energy of ejected photo electrons is(Plank's constant, $\mathrm{h}=\mathbf{6 . 6} \times \mathbf{1 0}^{-34} \mathrm{~J}-\mathrm{s}$ )

141980 The photoemission of electrons occur when a light of frequency $5 \times 10^{14} \mathrm{~Hz}$ is incident on a metal surface with work function of $2.0 \mathrm{eV}$. The maximum speed of emitted photoelectrons is approximately
(Planck's constant $=6.6 \times 10^{-34} \mathrm{Js}$, mass of electron $=9 \times 10^{-31} \mathrm{~kg}$ )

141982 A light of intensity $12 \mathrm{Wm}^{-2}$ incidents on a black surface of area $4 \mathrm{~cm}^{2}$. The radiation pressure on the surface is