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.

Question

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. (A) 6 × 1018 (B) 3 × 1017 (C) 6 × 1017 (D) 2 × 1015

Tardigrade Admin · Accepted Answer

Correct answer is (c) 6 × 1017

$6 \times 1 0^{18}$

$3 \times 1 0^{17}$

$6 \times 1 0^{17}$

$2 \times 1 0^{15}$

Correct answer is (c) $6 \times 1 0^{17}$

6×1018

3×1017

6×1017

2×1015

Correct answer is (c) 6×1017

$6 \times 1 0^{18}$

$3 \times 1 0^{17}$

$6 \times 1 0^{17}$

$2 \times 1 0^{15}$

Correct answer is (c) $6 \times 1 0^{17}$