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## Developments Leading to the Bohr’s Model of Atom MCQs

**1. ****If Energy = 4.5 KJ; calculate the wa****velength.**

a) 4.42 x 10^{-29} m

b) 4.42 x 10^{-39} m

c) 4.42 x 10^{-25} m

d) 4.42 x 10^{-22} m

**Answer: **4.42 x 10^{-29} m

**2. ________ frequency, is the minimum frequency required to eject an electron when photons hit the metal surface.**

a) Required

b) Activated

c) Threshold

d) Limiting

**Answer: **Threshold

**3. A metal’s work function is 3.8KJ. Photons strike metal’s surface with an energy of 5.2 KJ. what’s the kinetic energy of the emitted electrons?**

a) 3.8 KJ

b) 5.2 KJ

c) 9 KJ

d) 1.4 KJ

**Answer: **1.4 KJ

**4. When an electron jumps from 3rd orbit to 2nd orbit, which series of spectral lines are obtained?**

a) Balmer

b) Lyman

c) Paschen

d) Brackett

**Answer: **Balmer

**5. ****Find out the wavenumber, when an electron jumps from 2**^{nd}** orbit to 1**^{st}**.**

^{nd}

^{st}

a) 82357.75 cm^{-1}

b) 105,677 cm^{-1}

c) 82257.75 cm^{-1}

d) 109,677 cm^{-1}

**Answer: **82257.75 cm^{-1}

**6. The ultraviolet spectral region is obtained in Balmer series.**

a) True

b) False

**Answer: **False

**7. What’s the wavelength for the visible region in electromagnetic radiation?**

a) 400 – 750 nm

b) 400 – 750 mm

c) 400 – 750 ?m

d) 400 – 750 pm

**Answer: **400 – 750 nm

**8. Calculate the frequency of the wave whose wavelength is 10nm.**

a) 2 Hz

b) 3 Hz

c) 1 Hz

d) 4 Hz

**Answer: **3 Hz

**9. ****What is ****the wavenumber of violet color?**

a) 25 x 10^{3} mm^{-1}

b) 25 x 10^{3} m^{-1}

c) 25 x 10^{3} cm^{-1}

d) 25 x 10^{3} nm^{-1}

**Answer: **25 x 10^{3} cm^{-1}