Last thing to be recorded near Black Hole

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Homework Help Overview

The problem involves an alien civilization's spherical bot exploring the region around a black hole. The bot emits light tangentially to a circle centered on the black hole and has a sensor that only receives light radially. The task is to determine what the sensor records just before it perceives the blackness of the black hole.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to reason about light bending around the black hole and its effect on the sensor's perception. They question whether the sensor would receive a single image or a double image of surrounding stars due to the light's behavior near the black hole.
  • Some participants seek clarification on the relationship between the sensor and the emitter, questioning if the sensor receives light directly from the emitter.
  • Others express uncertainty about the concepts involved and suggest considering alternative perspectives.

Discussion Status

The discussion is ongoing, with participants exploring different interpretations of the problem. There is a focus on clarifying the setup and the concepts at play, but no consensus has been reached regarding the approach to take.

Contextual Notes

Participants express concerns about their understanding of the concepts involved, indicating a beginner's level of familiarity with the topic. There is a note of uncertainty regarding the implications of the bot's sensor and emitter configuration.

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Homework Statement




An alien civilization has sent a small Spherical bot, made of Sterling Silver,
fitted with a light emitter and sensor as depicted below, towards a black hole
to explore the region around it. The bot moves slowly towards the black hole,
radially into it. The light source emits light in such a way that it
is tangential (at
the pt. of emission) to a circle with ‘centre of black hole’ as its
centre, and the
distance between the black hole and the centre of the bot as its radius. The
region around the black hole is free of dust or any other obstacle, and there
are no other light sources anywhere nearby which can be perceived by the
sensor.
Due to some malfunction, the sensor of the bot receives only those signals,
which fall onto it radially.
What will be the last thing that the sensor records before it perceives the
blackness of the black hole?
NOTE : The effect of gravity of any other bodies other than the black hole on
the bot is negligible

Homework Equations





The Attempt at a Solution



As light bends around the black hole, there would be two rays coming to the sensor , thus forming double image of the surrounding stars... as it could receive signals only in radial direction, is it a single image of the surrounding stars?


Am I moving in the right direction or going wrong somewhere?
Please come up with a different solution (if any)


Umm...Sorry if am asking silly questions but try to answer them as am really a beginner :)
 
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please clarify - the sensor and emitter are on the same bot, then the sensor receives light from the emitter directly, isn't it?
 
supratim1 said:
please clarify - the sensor and emitter are on the same bot, then the sensor receives light from the emitter directly, isn't it?

Um...Yeah you are right ! but... I don't think it is right :frown:

Can you think it in other way?
 
pranathi said:
Can you think it in other way?

What other way are you suggesting?
 
supratim1 said:
What other way are you suggesting?

Um...may be, ignoring what you have told in the 1st reply and going with some cocnept ??
 
sorry i am not getting any idea of what concept to use here.
 

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