Which one of the following is massless?

A. Proton
B. Electron
C. Neutron
D. Photon

the photon is a massless particle. According to theory it has energy and momentum but no mass, and this is confirmed by experiment to within strict limits. Even before it was known that light is composed of photons, it was known that light carries momentum and will exert pressure on a surface. This is not evidence that it has mass since momentum can exist without mass.

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26 Comments

Waqas on 16/04/2019 12:27 AM
i think this question is that which one of following has no mass? b/c photon has no mass
- admin on 26/11/2019 3:49 AM
  Thanks dear Waqas for correction. title updated
  - Sohaib Roomi on 16/12/2019 12:44 AM
    Plz sir mention which type of proton which are in rest or motion .proton is massless in rest other wise moving which have mass
    - Qaisar Shahzad on 19/12/2019 2:05 PM
      Photon not proton.
sijawal on 15/05/2019 7:36 PM
photon is a massless
- admin on 26/11/2019 3:49 AM
  Thanks
Abdul Rehman on 09/07/2019 10:00 PM
ELECTEON, PROTON NEUTRON ALL HAVE MASS ONLY ONE QUANTITY THAT HAS NOT MASS THAT IS ONLY PHOTON .YU MADE MIStake .
- admin on 26/11/2019 3:49 AM
  Thanks for correction.
Zulqarnain khan on 01/08/2019 7:41 PM
Photon is mass less
- admin on 26/11/2019 3:50 AM
  Thanks dear Zulqarnain khan for correction.
Sheikh Faisal on 03/08/2019 5:54 PM
the photon is a massless particle. According to theory it has energy and momentum but no mass, and this is confirmed by experiment to within strict limits.
- admin on 26/11/2019 3:50 AM
  Thanks
Sheikh Faisal on 03/08/2019 5:55 PM
the photon is a massless particle.
- admin on 26/11/2019 3:50 AM
  updated
Waqas Ali on 14/09/2019 6:41 PM
photon has no mass so kindly correct this question
- admin on 26/11/2019 3:50 AM
  thanks. corrected
Zia on 16/10/2019 7:40 AM
This question must be like this…
Which one of the following HAVE NO mass?
As Photons have no mass. Rest of the particles do have.
- admin on 26/11/2019 3:51 AM
  Thanks dear Zia. updated now
Asghar ali on 20/10/2019 6:59 AM
This question is wrong, plz do correct
It should be massless…
- admin on 26/11/2019 3:51 AM
  you are right. question is updated now. Thanks dear Asghar ali
OSAMA MUNWAR on 17/11/2019 12:13 AM
Photon has no mass but other all options have mass.
- admin on 26/11/2019 3:52 AM
  updated. thanks
Naila on 23/11/2019 1:47 AM
Photon is mass-less
- admin on 26/11/2019 3:52 AM
  Thanks Dear Naila for correction.