What is it that we use to calculate the speeds of distant stars and galaxies?
Correct answer: A. Doppler Effect
- A. Doppler Effect
- B. Beats
- C. Interference
- D. All of the above
Explanation
Explanation:The Doppler effect is the phenomenon where the frequency of a wave (such as light or sound) appears to change when the source or the observer is in motion relative to each other. By analysing the shift in the frequency of light emitted by a distant star or galaxy, astronomers can determine its velocity relative to Earth. Beats can be used to measure the frequency difference between the two waves, but they are not typically used in astronomical measurements. Interference can be used to study the properties of light and other waves, but it is not typically used to calculate the speeds of distant stars and galaxies.
Last updated
About Progressive Waves
Progressive waves transfer energy through a medium or space while particles oscillate about their equilibrium positions. The work includes amplitude, wavelength, frequency, period, phase difference, wave speed and the progressive wave equation, while distinguishing travelling waves from stationary waves, where the pattern has fixed nodes and antinodes.
Practise Waves
1,281 free Waves MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Physics questions like this
Physics is on 13 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
20 waves pass through a point in a medium in 5 seconds. What is the time required to pass one wave?
A longitudinal wave is moving through a medium. Which of the following statements about the direction of propagation of wave and displacement of the medium is true?
A point source of light placed in a homogeneous medium gives rise to ___________________?
A sound wave has a wavelength of 0.20 m. What is the phase difference between two points along the wave which are 0.65 m apart?
A sound wave has a wavelength of λ. What is the minimum possible distance between two points with a phase difference of 90˚?