does the beam of light contains mass. If no then why???
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Explanation:
The short answer is "no", but it is a qualified "no" because there are odd ways of interpreting the question which could justify the answer "yes". Light is composed of photons, so we could ask if the photon has mass. The answer is then definitely "no": the photon is a massless particle.
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Explanation:
Light is composed of photons, which have no mass, so therefore light has no mass and can't weigh anything. Not so fast. Because photons have energy -- and, as Einstein taught us, energy is equal to the mass of a body, multiplied by the speed of light squared.
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