Which element has a hydrogen like spectrum whose lines have wavelength one fourth of atomic hydrogen ?

What element has a H like spectrum whose lines have wavelength four times shorter than those of atomic hydrogen?

What element has a hygrogen-like specturm whose lines have wavelength four times shorter than those of atomic hydeogen?

Which among the following has a hydrogen-like spectrum and whose lines have wavelengths four times shorter that those of atomic hydrogen?

Which among the following has a hydrogen-like spectrum and whose lines have wavelengths four times shorter that those of atomic hydrogen?

Name the series of hydrogen spectrum which has least wavelength.

Name the series of hydrogen spectrum, which has least wavelength.

The first line of the lyman series in a hydrogen spectrum has a wavelength of 1210 Å. The corresponding line of a hydrogen like atom of Z=11 is equal to

The first line of the lyman series in a hydrogen spectrum has a wavelength of 1210 Å. The corresponding line of a hydrogen like atom of Z=11 is equal to