How fast is the star moving? (Doppler effect)

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    Doppler effect Star
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Homework Help Overview

The discussion revolves around a problem related to the Doppler effect, specifically focusing on the frequency shift of light emitted by a star. The original poster presents a scenario where a star's emitted frequency changes from 6.00 × 10^14 Hz to 6.01 × 10^14 Hz, prompting a question about the star's velocity and direction of movement.

Discussion Character

  • Exploratory, Assumption checking, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the need for the original poster to demonstrate their work and reasoning. There are inquiries about the direction of the star's motion and suggestions to manipulate the relevant equations before substituting values.

Discussion Status

The discussion is ongoing, with participants encouraging the original poster to clarify their work and consider algebraic manipulation of the equations involved. There is no explicit consensus on the direction of motion yet, as it remains a point of inquiry.

Contextual Notes

Participants emphasize the importance of following forum rules regarding showing work and the need for clear presentation of mathematical expressions. The original poster's request for help is framed within these constraints.

HalJordan2814
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Homework Statement
how fast is the star moving problem doppler effect
Relevant Equations
z= λ observed - λ emitted/ λ observed
A type of star that usually emits light at a frequency of 6.00 × 10^14 Hz appears to emit light at a frequency of 6.01 × 10^14 Hz.
Calculate how fast the star is moving, and if it moving towards us or away from us.
 
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Welcome to PhysicsForums. :smile:

Per the PF rules, you need to show your best efforts to start working the problem before we can offer tutorial help.
 
yeah sure
 

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Please post a better image of your work (not sideways, good contrast and legible), or better yet please type your work into the forum. See the LaTeX Guide link in the lower left of the Edit window to learn how to post math equations here. Thanks.
 
HalJordan2814 said:
yeah sure
The answer looks correct, although you don't say what's the direction of motion.
 
HalJordan2814 said:
Homework Statement:: how fast is the star moving problem doppler effect
Relevant Equations:: z= λ observed - λ emitted/ λ observed

A type of star that usually emits light at a frequency of 6.00 × 10^14 Hz appears to emit light at a frequency of 6.01 × 10^14 Hz.
Calculate how fast the star is moving, and if it moving towards us or away from us.
Did you consider doing a bit of algebra to get ##z## in terms of frequencies before you plugged the numbers in?
 

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