Hydrogen Spectrum, Heisenberg’s Uncertainty & energy level

When a gas is heated in a discharged tube at __________, it emits radiation.

• low pressure

• high pressure

• low temperature

• high temperature

_________ studied the spectrum of hydrogen gas.

• balmer

• lyman

• paschen

• brakett

Balmer found a series of lines in visible region having λ between ________.

• 3000 to 7000 A^o

• 4000 to 7000 A^o

• 3000 to 6000 A^o

• 3500 to 7000 A^o

All the atoms in excited state, due to their high energy, are___________.

• violated

• stable

• unstable

• unviolated

Electron also behave as a wave, according to________.

• De Morgan principle

• De Broglie principle

• heisenberg's principle

• jen's law

It was not possible to determine simultaneously the position and __________ of a moving particle.

• inertia

• momentum

• force

• motion

If one of the two p_x and x was known exactly, then the uncertainty in its determination could be zero and that of other would become________.

• zero

• 1

• -1

• infinity

__________ explain the basic incompleteness of the bohr-modle of atom.

• De Morgan's principle

• De Broglie principle

• jen's

• heisenberg principle

The maximum possible number of electrons a shell ‘n’ can be accommodate in given by ________.

• 2n²

• 2n

• 2n³

• 2n^-3

The bohr’s circular orbits are usually referred to as __________.

• element

• particle

• energy levels

• molecule