Density of potassium is 2.64 xx 10^(6) g m^(-3) . What is the radius of metal atom?
A metal oxide has the fomula M_2O_3 . It can be reduced by hydrogen to give free metal and water. 0.16g of the metal requires 6mg of H_2 for complete reduction. The atomic mass of the metal is .n? times the atomic number of calcium. The value of .n. is
3.011 xx 10^(22) atoms of an element weighs 1.15 g. The atomic mass of the element is
The work function of caesium metal is 2.14 eV . When light of frequency 6xx 10^(14) Hz is incident on the metal surface , photomission of electrons occurs . What is the maximum speed of the emitted photoelectrons ?
A line in Lyman series of hydrogen atom has a wavelength of 1.03xx10^(-7)m . What is the initial energy level of the electron ?
If a metal is irradiated with light of frequency 3 xx 10^(19) sec^(-1) , electron is emitted with kinetic energy of 6.625 xx 10^(-15)J . The threshold frequency of the metal is
