एक एक्स-किरण नली पर कितना विभव लगाया जाए कि एक्स किर्णो का तरंगदैधर्य `1 Å` हो? `(h=6.6xx10^(-34)Js, e=1.6xx10^(-19)C` तथा प्रकाश की चाल `=3xx10^(8)ms^(-1))`

Frequency of photon having 100 eV energy is ……Hz [ h=6.62xx10^(-34)Js,1eV=1.6xx10^(-19)Js]

Light of wavelength 4000 Å falls on a photosensitive metal and a negative 2 V potential stops the emitted electrons. The work function of the material ( in eV) is approximately ( h = 6.6 xx 10^(-34) Js , e = 1.6 xx 10^(-19) C , c = 3 xx 10^(8) ms^(-1))

An X-ray tube operates on 30 kV. What is the minimum wavelength emitted (h=6.6 xx10^(-34)Js,e=1.6xx10^(-19)"Coulomb",c=3xx10^(8)ms)

By how much would the stopping potential for given photosensitive surface go up if the frequency of the incident radiations were to be increased from 4xx10^(15) Hz to 8xx10^(15)Hz ? Given h = 6.4xx10^(-34) J.s, e = 1.6xx10^(-19)C and c = 3xx10^(8) m.s^(-1) .

The energy of an X-ray photon of wavelength 1.65Å is (h=6.6xx10^(-34)Js,c=3xx10^(4)ms^(-1),ev=1.6xx10^(-19)J)

The energy of X-ray photon of wavelength 1.65 Å is (h=6.6 xx 10^(-34)J-sec,c=3xx10^(8)ms^(-1),1eV=1.6xx10^(-19)J)

What is the wavelength of light . Given energy =3.03xx10^(-19)J, h=6.6xx10^(-34)JS, c=3.0xx10^(8)m//s ?

By how which would the stopping potential for a given photosensitive surface go up if the frequency of the incident radiations were to be increased from 6xx10^(15)Hz to 16xx10^(15)Hz ? Given, h=6.6xx10^(-34)Js , e=1.6xx10^(-19)C and c=3xx10^8ms^-1 .