A sensor is exposed for time $t$ to a lamp of power $P$ placed at a distance $l$. The sensor has a circular opening that is $4d$ in diameter. Assuming all energy of the lamp is given off as light, the number of photons entering the sensor if the wavelength of light is $\lambda $ is $(l >> d)$
$\frac{{P\lambda {d^2}t}}{{hc{l^2}}}$
$\frac{{4P\lambda {d^2}t}}{{hc{l^2}}}$
$\frac{{P\lambda {d^2}t}}{{4hc{l^2}}}$
$\frac{{P\lambda {d^2}t}}{{16hc{l^2}}}$
Given below are two statements
Statement$-I :$ Two photons having equal linear momenta have equal wavelengths.
Statement$-II :$ If the wavelength of photon is decreased, then the momentum and energy of a photon will also decrease.
In the light of the above statements, choose the correct answer from the options given below.
The work function of a photoelectric material is $3.3 eV$. The threshold frequency will be equal to
In photoelectric effect, the electrons are ejected from metals if the incident light has a certain minimum
Which of one is correct