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Developments Leading to the Bohr’s Model of Atom MCQs

1. If Energy = 4.5 KJ; calculate the wavelength.

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.

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 μm

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 10³ mm^-1

b) 25 x 10³ m^-1

c) 25 x 10³ cm^-1

d) 25 x 10³ nm^-1

Answer: 25 x 10³ cm^-1

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Categories: Structure of Atom