JEE · NEET Previous Year Question
If a star emitting yellow light is accelerated towards earth, then to an observer on earth it will appear
Topic: JEE PYQ
Answer: C. Full step-by-step solution below.
- Abecoming orange
- Bshining yellow
- Cgradually changing to blue
- Dgradually changing to red.
Correct answer: C
Solution
(c) : In case of astronomical Doppler effect, when source and observer move towards each other then change in frequency becomes positive. Thus apparent frequency as observed by observer increases or apparent wavelength decreases,Therefore, if a star, emitting yellow light, is accelerated towards Earth, then to an observer on Earth it will appear gradually changing to blue. It is known as 'blue sift.
More Wave Optics PYQs
- A beam of light with intensity and cross sectional area is incident on a fully r…
- In a double slit experiment the distance between the slits is 0.1 cm and the screen is placed at 50 cm from the slits plane. When…
- In Young's double slit experiment, the wavelength of light used is ' '. The intensity at a point is where path di…
- In a Young s double slit experiment, the ratio of the slit s width is The ratio of the intensity of maxima to minima,…
- In a diffraction pattern due to a single slit of width , the first minimum is observed at an angle when light…