The wave emtted by any atom or molecule must have some finite total length .For sodium light this length(called coherne length)is 2.4 cm.Deduce
the cohernece time.Given that`gamma=5*9 xx 10^(-7)` cm and `c=3.0 xx 10^8 m s^(-1)`.

The wave emitted by any atom or molecule must have some finite total length. For sodium light this length(called coherence length)is 2.4 cm.Deduce the number of oscillations in this length

2 xx 10^(8) atoms of carbon are arranged side by side. Calculate the radius of carbon atom if the length of this arrangement is 2.4 cm.

Calculate the radius of the third orbit of the electron in hydrogen atom.Given that Planck's constant, h=6.62 xx 10^(-34) J s,m=9.1 xx 10^(-31) kg,e=1=1.6 xx 10^(-19)C .

What is the wave length of a television station,which transmits vision in 500 MHz? Given c=3 xx 10^8 m s^(-1) .

The energy of an electron in an excited hydrogen atom is -3.4 eV . Calculate the angular momentum of the electron according to Bohr's theory. (Given Rydberg's constant R=1.09737 xx 10^-7 m^-1, h=6.626176 xx 10^-34 Js, c=3 xx 10^8 ms^-1) .

Green light of mercury has a wavelength 5*5 xx 10^(-5) cm. What is the wavelength in glass,if refractive index of glasss is 1.5?Given, c=3 xx 10^8 m s^(-1) .

What is the Coulomb.s force between two small charged spheres having charges 2.0xx10^-7 C and 3.0 xx 10^-7 Coulomb placed 30 cm in air.