2.1: Bohr Atomic Model

_____________________ is the lowest energy level an electron will occupy in an atom at an ordinary condition

• ground state

• excited state

If energy is supplied, electron ___________ the energy and is _____________ from a lower energy level to a higher ones.

• absorbed, promoted

• emitted, promoted

• absorbed, demoted

• emitted, demoted

At excited state electron is _______________and it will fall back to lower energy level and released a specific amount of ________________ in form of light (photon).

• unstable, energy

• stable, wavelength

What is the region for Pfund series?

• Ultraviolet

• Bluelight

• Infrared

• Visible

According to Bohr's model, how do electrons travel?

• Electrons move in and out of the nucleus

• Electrons do not move

• Electrons move in circular orbits around the nucleus

• Electrons move in a straight line

A spectrum containing only electromagnetic radiation of discrete specific wavelengths is known as

• line spectrum

• continuous spectrum

• visible spectrum

• valence spectrum

How the second line in the Balmer series of the hydrogen spectrum is formed?

• n=6 to n=4

• n=3 to n=1

• n=5 to n=3

• n=4 to n=2

Which the equation show the relationship among wavelength, frequency, and speed of radiation.

• $\Delta E\ =\frac{hc}{\lambda}$

• $\Delta E=hv$

• $\lambda\ =\ \frac{c}{v}$

• $En=-\ R_{H\ }\left(\frac{1}{n^2}\right)$

When an electron jumps from its orbit to another orbit, energy is

• emitted only

• absorbed only

• absorbed only

• emitted or absorbed

State the transition of line T in Brackett series.

• n=5 to n=3

• n=6 to n=4

• n=7 to n=4

• n=6 to n=3