Q8. For a specific wavelength 670 nm of light coming from a galaxy moving with velocity v, the observed wavelength is 670. 7 nm. The value of v is (1) 3 × 108 m s−1 (2) 3. 13 × 105 m s−1 (3) 3 × 1010 m s−1 (4) 4. 48 × 105 m s−1
What This Question Tests
This question requires applying the Doppler effect formula for light to calculate the velocity of a galaxy based on the observed redshift in its wavelength.
Concepts Tested
Formulas Used
Δλ/λ = v/c
📚 NCERT Sections This Tests
10.3 — (A) The Refractive Index Of Glass Is 1.5. What Is The Speed Of Light In
Physics Class 12 · Chapter 10
10.3 (a) The refractive index of glass is 1.5. What is the speed of light in glass? (Speed of light in vacuum is 3.0 × 108 m s–1) (b) Is the speed of light in glass independent of the colour of light? If not, which of the two colours red and violet travels slower in a glass prism?
11.8 — Light Of Frequency 7.21 × 1014 Hz Is Incident On A Metal Surface.
Physics Class 12 · Chapter 11
11.8 Light of frequency 7.21 × 1014 Hz is incident on a metal surface. Electrons with a maximum speed of 6.0 × 105 m/s are ejected from the surface. What is the threshold frequency for photoemission of electrons?
10.1 — Monochromatic Light Of Wavelength 589 Nm Is Incident From Air On A
Physics Class 12 · Chapter 10
10.1 Monochromatic light of wavelength 589 nm is incident from air on a water surface. What are the wavelength, frequency and speed of (a) reflected, and (b) refracted light? Refractive index of water is 1.33.
📋 Question Details
- Chapter
- EM Waves
- Topic
- Doppler effect in light
- Year
- 2022
- Shift
- 26 Jun Shift 2
- Q Number
- Q8
- Type
- MCQ
- NCERT Ref
- Class 12 Physics Ch 8: Electromagnetic Waves
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