1. Tardigrade
  2. Question
  3. Physics
  4. Light of wavelength λ from a small 0.5 mW He - Ne laser source, used in the school laboratory, shines from a spacecraft of mass 1000 kg. Estimate the time needed for the spacecraft to reach a velocity of 1.0 km s -1 from rest. The momentum λ of a photon of wavelength λ is given by p=h / λ, where h is Planck's constant.

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Q. Light of wavelength $\lambda$ from a small $0.5\, mW \,He - Ne$ laser source, used in the school laboratory, shines from a spacecraft of mass $1000 \,kg$. Estimate the time needed for the spacecraft to reach a velocity of $1.0 \,km \, s ^{-1}$ from rest. The momentum $\lambda$ of a photon of wavelength $\lambda$ is given by $p=h / \lambda$, where $h$ is Planck's constant.

Dual Nature of Radiation and Matter

Solution:

Correct answer is (c) $6 \times 10^{17}$