Question
The ionization potential for second He electron is
|
(a) 13.6 eV |
(b) 27.2 eV |
(c) 54.4 eV |
(d) 100 eV |
✓
Answer
(c) 54.4 eV
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Which of the following is false for electric lines of force ?
A point object O is placed on the principal axis of a convex lens of focal length f = 20cm at a distance of 40cm to the left of it. The diameter of the lens is 10cm. An eye is placed 60cm to right of the lens and a distance h below the principal axis. The maximum value of h to see the image is:
- 0
- 2.5cm
- 5cm
- 10cm.
In series connection of resistors, what happens to the current across each resistor?
In a cathode ray oscillograph, the focusing of beam on the screen is achieved by:
An EM wave of intensity I falls on a surface kept in vacuum and exerts radiation pressure p on it. Which of the following are true?
The potential difference between points A and B of adjoining figure is
(a) 
|
(b) 
|
(c) |
(d) 2 V |
The energy resides in a current carrying inductor in the form of:
Which of the following is deflected by electric field
|
(a) X-rays |
(b) γ -rays |
(c) Neutrons |
(d) α -particles |
The efficiency of transformer is very high because
|
(a) There is no moving part in a transformer |
(b) It produces very high voltage |
|
(c) It produces very low voltage |
(d) None of the above |
The wavelength 
of the 
line of characteristic X-ray spectra varies with atomic number approximately
(a)
|
(b) 
|
(c) 
|
(d)  
|