A 60 W bulb is placed at a distance of 4 m from you. The bulb is emtting light of wavelength 600 nm uniformly in all directions. In 0.1 s, how many photons enter your eye if the pupil of the eye is having a diameter of 2mm? [take `hc=1240eV-nm]`

A 100 W sodium lamp is radiating light of wavelength 5890A , uniformly in all directions, a. At what rate, photons are emitted from the lamp? b. At what distance from the lamp, the average flux is 1 photon( cm^2-s)^-1? c. What are the photon flux and photon density at 2m from the lamp?

A 100 W sodium lamp is radiating light of wavelength 5890A , uniformly in all directions, a. At what rate, photons are emitted from the lamp? b. At what distance from the lamp, the average flux is 1 photon( cm^2-s)^-1? c. What are the photon flux and photon density at 2m from the lamp?

A bulb of 40 W is producing a light of wavelength 620 nm with 80% of efficiency , then the number of photons emitted by the bulb in 20 seconds are : ( 1eV = 1.6 xx 10^(-19) J , hc = 12400 eV )

A bulb of 40 W is producing a light of wavelength 620 nm with 80% of efficiency , then the number of photons emitted by the bulb in 20 seconds are : ( 1eV = 1.6 xx 10^(-19) J , hc = 12400 eV )

If our eye receive a signal consisting of light having wavelengths lambda=620mm . If energy of signal is 32xx10^(-13)J then how many photons reach your eyes. [Given: hc=1240eV-nm]

All electrons ejected from a surface by incident light of wavelength "200nm" can be stopped before travelling 1m in the direction of uniform electric field of "4N/C" .Find the work function of the surface in eV

A sample of hydrogen atom is in excited state (all the atoms ). The photons emitted from this sample are made to pass through a filter through which light having wavelength greater than 800 nm can only pass. Only one type of photons are found to pass the filter. The sample's excited state initially is [Take h c = 1240 eV -nm , ground state energy of hydrogen atom = - 13.6 eV] .

A sample of hydrogen atom is in excited state (all the atoms ). The photons emitted from this sample are made to pass through a filter through which light having wavelength greater than 800 nm can only pass. Only one type of photons are found to pass the filter. The sample's excited state initially is [Take h c = 1240 eV -nm , ground state energy of hydrogen atom = - 13.6 eV] .

A sensor is exposed for 0.1 s to a 200 W lamp 10m away The sensor has an opening that is 20 mm in diameter. How many photons enter the sensor if the wavelength of light is 600nm? Assume that all the energy of the lamp is given off as light.

A sensor is exposed for 0.1 s to a 200 W lamp 10m away The sensor has an opening that is 20 mm in diameter. How many photons enter the sensor if the wavelength of light is 600nm? Assume that all the energy of the lamp is given off as light.