What speed should a galaxy move with respect to us so that the sodium line at 589.0 nm is observed at 589.6 nm?

1. 164 km/s

2. 332 km/s

3. 102 km/s

4. 306 km/s

Subtopic:  Huygens' Principle |
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Which one of the following is incorrect?

1. When monochromatic light is incident on a surface separating two media, the reflected and refracted light both have the same frequency as the incident frequency. 

2. When light travels from a rarer to a denser medium, the speed decreases. The reduction in speed implies a reduction in the energy carried by the light wave.

3. In the wave picture of light, the intensity of light is determined by the square of the amplitude of the wave. 

4. For a given frequency, the intensity of light in the photon picture is determined by the number of photons crossing a unit area per unit time.

Subtopic:  Huygens' Principle |
To view explanation, please take trial in the course below.
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Please attempt this question first.
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NEET MCQ Books for 11th Physics, Chemistry & Biology