परमाणु एवं अणु - L11 | Atoms and Molecules| अणुभार | CLASS 9 विज्ञान | 7 PM Nishtha mam

Atom(परमाणु )|Molecule(अणु)|Structure Of Atoms(परमाणुओं की संरचना)|Summary

Atom(परमाणु)|Molecule(अणु)|Structure Of An Atom(परमाणु की संरचना)|Electron, Proton, Neutron|Summary

Matters (पदार्थ)|Atom (परमाणु)|Molecule (अणु)|Structure Of An Atom (परमाणु की संरचना)|Summary

The wavelength of K_alpha X-ray of tungsten is 21*3 pm. It takes 11*3 keV to knock out an electron from the L shell of a tungsten atom. What shoulb be the minimum accelerating voltage across an X-ray tube having trungsten target which allows production of K_alpha X-ray?

A train leaves Pune at 7 :30 am and reaches Mumbai at 11 : 30 am. Another train leaves Mumbai at 9 : 30 am and reaches Pune at 1 : 00 pm. Assuming that the two trains at constant speeds, at what time do the two trains cross each other-

A gas bulb of 1 L capacity contains 2.0xx10^(11) molecules of nitrogen exerting a pressure of 7.57xx10^(3)Nm^(-2) . Calculate the root mean square (rms) speed and the temperature of the gas molecules. If the ratio of the most probable speed to the root mean square is 0.82 , calculate the most probable speed for these molecules at this temperature.

The wavelength of K_(alpha) X-ray of tungsten is 21.3 pm. It takes 11.3 keV to knock out an electron from the L shell ofa tungsten atom. What should be the minimum accelerating voltage across an X-ray tube having tungsten target which allows production of k_(alpha) X-ray ?

The given figure shows the set-up to study the reaction between gas X and copper (II) oxide : Which of the following statements are correct? [Given : Atomic mass of N = 14 u, H = 1 , O = 16 u, C = 12 u] I. Gas X is a compound of two elements, nitrogen and hydrogen. II. The number of atoms present in 11.2 L of N_(2) is 6.023 xx10^(23) . III. 1 mole of H_(2)O contains 1 mole of oxygen molecules and 2 moles of hydrogen atoms. IV. N_(2) gas being soluble in water is collected by upward displacement of water.