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In how many ways 6 students and 4 teachers be arranged in a row so that no two teachers are together ?

The energy of an element with a vacancy in K-shell is 35.2 keV, in L-shell is 5.25 keV and in M-shell is 0.55 keV higher than the energy of the atom of with no vacancy. Find the frequency of K_(alpha),K_(beta) and L_(alpha) X-rays of that element.

The energy of a silver atom with a vacancy in K shell is 25.31 keV, in L shell is 3.56 keV and in M shell is 0.530 keV higher than the energy of the atom with no vacancy. Find the frequency of K_alpha , K_beta and L_alpha X-rays of silver.

The mean ago of 25 teachers in a schools is 40 years. A teacher retires at the age of 60 years and a new teacher is appointed in his place . If now the mean age of the teachers in this schools is 39 years, then the age (in years) of the newly appointed teacher is

The energy of a tungsten atom with a vacancy in L small is 11.3 KaV . Wavelength of K_(alpha) photon for tungsten is 21.3 "pm" . If a potential difference of 62 kV is applied across the X -raystube following characterstic X-rays will be produced.

There are six teachers. Out of them two are primary teacher, two are middle teachers, and two are secondary teachers. They are to stand in a row, so as the primary teachers, middle teacher, and secondary teachers are always in a set. Find the number of ways in which they can do so.

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Calculate the wavelength of the emitted characteristic X-ray from a tungsten (Z = 74) target when an electrons drops from an M shell to a vacancy in the shell.

44% of the teachers in a school are males and the number of female teachers is 42. Find the total number of teachers in the school.

There are 7 men and 3 ladies contesting for two vacancies, an elector can vote for any number of candidates not exceeding the number of vacancies. In how many ways can be vote?