Bohr model of atom (Gr11)

Who proposed that electrons are only found in specific, discrete circular orbits around the nucleus?

• Albert Einstein

• Erwin Schrodinger

• Ernest Rutherford

• Niels Bohr

When atoms _____________ energy, their electrons move to higher energy levels. These electrons _____________ energy by emitting light when they return to lower energy levels.

• lose, absorb

• absorb, lose

• lose, lose

• absorb, absorb

Which form of radiation has the highest frequency?

• radio waves

• ultraviolet

• x-ray

• gamma

What is the radius of 1st orbit of He+ ?

• 52.9pm

• 26.4pm

• 13.4pm

• 36.5pm

How much energy is released when an electron in the 5th orbit of H atom falls to 2nd orbit?

• - 4.28x10^-19J

• 1.07x10^-19J

• 4.28x10^-19J

• -1.07x10^-19J

Name the series of spectral lines of H atom observed in the visible region.

• Lyman

• Balmer

• Paschen

• Pfund

What is the radius of 4th orbit of H atom if the radius of 1st orbit is r₀ ?

• 4 r₀

• 16r₀

• 9r₀

• 2r₀