The unit of Rydberg constant is ______________.

(a)

m

(b)

no unit

(c)

m^-2

(d)

m^-1

A Coolidge tube operates at 18600 V. The maximum frequency of X-radiation emitted from it is ______.

(a)

4.5 x10¹⁸ Hz

(b)

45 x 10¹⁸ Hz

(c)

4.05 x 10¹⁸ Hz

(d)

45.5 x 10¹⁸ Hz

The spectral series of hydrogen atom in UV region is called ____________.

(a)

balmer series

(b)

lyman series

(c)

paschan series

(d)

pfund series

In a discharge tube, the source of positive rays is ________________.

(a)

cathode

(b)

anode

(c)

gas atoms present in the discharge tube

(d)

fluorescent screen

The ionisation potential of hydrogen atom is ______________.

(a)

13.6eV

(b)

-13.6eV

(c)

13.6 V

(d)

-13.6 V