The wavelength of most energetic X-rays emitted when a metal target is bombarded by `40 keV` electrons, is approximately
`(h=6.62xx10^(-34)J-sec,1eV=1.6xx10^(-19)J,c=3xx10^(8)m//s)`.

The wavelength of the most energetic X–ray emitted when a metal target is bombarded by 100 KeV electrons is approximately

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)

The work function of caesium is 2.14 eV. When light of frequency 6xx10^(14)Hz is incident on the metal surface, photoemission of electrons occurs. What is the (a) maximum kinetic energy of the emitted electrons. (b) stopping potential and (c) maximum speed of the emitted photoelectrons. given , h=6.63xx10^(-34)Js, 1eV=1.6xx10^(-19)J, c=3xx10^(8)m//s .

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))

Radius of the third Bohr orbit of the electron of the hydrogen atom is (Given h=6.625xx10^(-34)J-s,e=1.6xx10^(-19)C,epsi_(0)=8.85xx10^(-12)Fm^(-1) )

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

Calculate the radius of the first and second orbit of sodium atom (Z=11) . (h=6.6xx10^(-34) J s, e=1.6xx10^(-19) C and m=9.1xx10^(-31) kg.)

The de-Broglie wavelength of an electron is 600 nm . The velocity of the electron is: (h = 6.6 xx 10^(-34) J "sec", m = 9.0 xx 10^(-31) kg)

The H_(alpha) line of Balmer series is obtained from the transitio n=3 (energy=-1.5eV) to n=2 (energy =-3.4 eV). What is the wavelength for this line. Given, h=6.6xx10^(-34)Js:1eV=1.6xx10^(-19)J,c=3xx10^(8)ms^(-1)