As per given figure A,B and C are the first,second and third excited energy levels hydrogen atom respectively. If the ratio of the two wavelengths (ie. `lambda_1`//`lambda_2`) is `7/(4n)` then the value of n will be

Some energy levels of a molecule are shown in the figure. The ratio of the wavelengths r = lambda_1//lambda_2 is given by -

Some energy levels of a molecule are shown in the fig. The ratio of the wavelengths r=lambda_(1)//lambda_(2) , is given by

If lambda_(1), lambda_(2), lambda_(3) are the wavelengths of the waves giving resonance in the fundamental, first and second overtone modes respecively in a open organ pipe, then the ratio of the wavelengths lambda_(1) : lambda_(2) : lambda_(3) , is :

In the hydrogen atom spectrum, lambda_(3-1) and lambda_(2-1) represent wavelengths emitted due to transition from second and first excited states to the ground state respectively . The ratio (lambda_(3-1))/(lambda_(2-1))=(p)/(q) , where p and q are the smallest positive integers . What is the value of ( p + q ) ?

Electron in hydrogen atom first jumps from third excited state to second excited state and then form second excited state to first excited state. The ratio of wavelength lambda_(1): lambda_(2) emitted in two cases is

If lambda_1 and lambda_2 , are the wavelengths of the third member of Lyman and first member of the Paschen series respectively, then the value of lambda_1:lambda_2 is:

If lambda_1, lambda_2 and lambda_3 are the wavelength of the waves giving resonance to the fundamental, first and second overtone modes respectively in a string fixed at both ends. The ratio of the wavelengths lambda_1:lambda_2:lambda_3 is

Two metal spheres have radii rand 2r and they emit thermal radiation with maximum intensities at wavelengths lambda and 2lambda . respectively. The respective ratio of the radiant energy emitted by them per second will be

The shortest wavelength of the spectrum for transition of an electron to n=4 energy level of a hydrogen like atom(atomic number = Z) is the same as the shortest wavelength of the Balmer series of hydrogen atom.The value of Z is: