Photon momentum and energy question

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Homework Help Overview

The discussion revolves around the relationship between the properties of photons, specifically focusing on momentum, wavelength, energy, and frequency. Participants are examining a multiple-choice question regarding which properties imply equality of linear momentum among photons.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants are questioning the validity of the options presented in the problem, with one participant expressing confusion over why multiple options seem correct. Others are discussing the implications of linear momentum being a vector quantity compared to scalar quantities like wavelength, energy, and frequency.

Discussion Status

The discussion is ongoing, with participants exploring different interpretations of the problem. Some have offered insights into the nature of linear momentum and its vector characteristics, while others are seeking clarification on the correctness of the provided options.

Contextual Notes

There is an indication that the original poster is looking for explanations regarding the incorrectness of certain options based on the definitions and relationships between the physical quantities involved.

metalrose
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Homework Statement



Choose the correct option (only one correct option)
Two photons having
A.) equal wavelengths have equal linear momenta
B.) equal energies have equal linear momenta
C.) equal frequencies have equal linear momenta
D.) equal linear momenta have equal wavelengths

Homework Equations



λ=h/p
E=pc
f=c/λ

The Attempt at a Solution



All options seem correct to me. But the correct answer given in my book is the option d.)

Looking for an explanation for why the other three are incorrect.
 
Physics news on Phys.org
linear momentum is a vector.
wavelength, energy, and frequency, are not.
All are correct if they said "equal magnitude".
 
Simon Bridge said:
linear momentum is a vector.
wavelength, energy, and frequency, are not.
All are correct if they said "equal magnitude".

Thanks a lot. I don't know how overlooked that ..!
 
Actually it took me a little while longer than I'd have liked.
And it is because of how we are used to seeing those equations.
Cheers.
 

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