Atomic Spectra Set 4 - ilmijazeera

Results

#1. The radius of 3rd Bohr orbit in H-atom is greater than the radius of 1st orbit by the factor

#2. The orbital angular momentum in the allowed stationary orbits of H-atom is given by:

(2pi)/nh

(nh)/ (2pi)

2h/ (n pi)

pi/pi

#3. If one or more electrons are completely removed from an atom then the atom is said to be

Excited

Polarized

Stabilized

Ionized

#4. The quantized radius of first Bohr orbit of H- atom is

0.053 nm

0.0053 nm

0.00053 m

53 nm

#5. Helium-Neon laser discharge tube contains Neon equal to:

25%

40%

15%

82%

#6. The value of Rydberg constant is:

1.0974 * 10 ^ 7 * m ^ - 1

1.0794 * 10 ^ 7 * m ^ - 1

1.0974 * 10 ^ 9 * m ^ - 1

1.974 * 10 ^ 7 * m ^ - 1

#7. When an electron absorbs energy, it jumps to:

Lower energy state

Higher energy state

Ground energy state

Remains in the same state

#8. LASER light has the property of:

Coherent waves

Non-coherent waves

Sound waves

Water waves

#9. Excited atoms return to their ground state in

10 ^ - 10 * s

10 ^ - 8 * s

10 ^ -6 * s

10^- 9*s

#10. X-rays are

Unknown nature

High energy electrons

High energy photon

Radioisotopes

Finish