WorksheetsSize and energy in the ground state of hydrogen atom
Total questions: 10
Worksheet time: 5mins
A Balmer series spectrum is formed when electrons from excited state fall down to ground state of n= (a) .
In 1897, J J Thomson discovered the electron. This led him to propose the (a) -pudding model of the atom.
The angular momentum (L) of an electron moving in a stable orbit around nucleus is
Half integral multiple of 2πh
Integral multiple of h
Integral multiple of 2πh
Half integral multiple of h
When an electron moves from n=4 to n=1, what wavelength of energy is emitted?
97 nm
410 nm
434 nm
1282 nm
An atom has a mass number of 23 and atomic number 11. The number of protons is _________.
11
12
23
44
A copper wire has a diameter of 0.5 mm and resistivity of 1.68 X 10-3 Ωm. What will be the length of this wire to make its resistance of 2Ω.
23.3m
20.3m
25.3m
30.3m
Which one of the following represents forward biasdiode?
The tunnelling through a potential barrier increases if
Hight and width of the barrier increased
Height and width of the barrier reduced
Height increased and width reduced of the barrier
Height reduced and width increased of the barrier
If a small amount of antimony is added to germanium crystal
it becomes a p-type semiconductor
the antimony becomes an acceptor atom
there will be more free electrons than holes in the semiconductor
its resistance is increased
Two ideal diodes are connected to a battery as shown in the circuit. The current supplied by the battery is
0.75A
0A
0.25A
0.5 A
