Question

The wavelength of the Balmer $H_{\alpha }$ line is $6565\mathring{A}$. The wavelength of $H_{\beta }$, line of a hydrogen-like atom is:

• A. $4863\stackrel{o}{A}$
  
• B. $3456\stackrel{o}{A}$
  
• C. $4500\stackrel{o}{A}$
• D. $2345\stackrel{o}{A}$
  

Answer 1

The correct option is A $4863\stackrel{o}{A}$

The wavelengths of four lines in the Balmer series are $6565\stackrel{o}{A},4863\stackrel{o}{A},4341\stackrel{o}{A}and4102\stackrel{o}{A}$. They are called $H_{\alpha },H_{\beta },H_{\gamma }and{H}_{\delta }$ respectively.