Do all the electrons that absorb a photon come out as photoelectrons?

During collision of electrons and photons,

Are all the valence electrons of cabon atoms in graphite localized to specific covalent bonds?

Are all the valence electrons of carbon atoms in graphite localized to specific covalent bonds ?

Ultraviolet light of wavelength 300nn and intensity 1.0Wm^-2 falls on the surface of a photosensitive material. If one per cent of the incident photons produce photoelectrons, then the number of photoelectrons emitted per second from an area of 1.0 cm^2 of the surface is nearly

The de Broglie wavelength of an electron moving with a velocity of 1.5×10 8 m/s is equal to that of a photon. Find the ratio of the kinetic energy of the photon to that of the electron.

In the explanation of photoelectric effect, we assume one photon of frequency nu collides with an electron and transfers its energy. This leads to the equation for the maximum energy E_max of the emitted electron as, E_max = h nu - phi_0 whare phi_0 is the work function of the metal . If an electron absorbs two photons (each of frequency nu ) what will be the maximum energy for the emitted electron ?

Fill in the blanks using the correct words given in the brackets : The layer of ozone gas absorbs_____ rays that come from the sun to the earth.

A photon and an electron have the same wavelength then, the velocity of photon is