Class 12 Chemistry · Chapter 13 · Test 1
Radiation and Atomic Spectra
40 MCQs
40 questions · 35 min · 40 marks
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Sample questions
The first 5 of 40. Try each one, then tap to see the answer.
Question 1
Light and other electromagnetic radiation travel as waves consisting of:
- AOscillating electric and magnetic fields
- BOnly electric fields
- COnly sound waves
- DParticles with mass only
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Answer: A
They are defined by their wavelength and frequency.
Question 2
The relationship between wavelength and frequency is:
- Ac = λ/ν
- Bc = λν
- Cc = ν/λ
- Dc = λ + ν
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Answer: B
c = λν where c is the speed of light.
Question 3
The speed of light is:
- A3.0 x 10^6 m/s
- B3.0 x 10^10 m/s
- C3.0 x 10^8 m/s
- D3.0 x 10^5 m/s
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Answer: C
c = 3.0 x 10^8 m/s.
Question 4
What is the frequency of light of wavelength 600 nm (c = 3.0 x 10^8 m/s)?
- A2.0 x 10^-15 Hz
- B5.0 x 10^12 Hz
- C1.8 x 10^17 Hz
- D5.0 x 10^14 Hz
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Answer: D
ν = 3.0 x 10^8 / 6.0 x 10^-7 = 5.0 x 10^14 Hz.
Question 5
What is the wavelength of radiation of frequency 1.0 x 10^15 Hz?
- A300 nm
- B3000 nm
- C30 nm
- D3.0 x 10^23 nm
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Answer: A
λ = 3.0 x 10^8 / 1.0 x 10^15 = 3.0 x 10^-7 m = 300 nm.
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