Question

Optical tweezers use light from a laser to move single atoms and molecules around. Suppose the intensity of light from the tweezers is 1000 W/m², the same as the intensity of sunlight at the surface of the Earth.

(a) What is the pressure on an atom if light from the tweezers is totally absorbed?
Pa

(b) If this pressure were exerted on a helium atom, what would be its acceleration? (The mass of a helium atom is 6.65 ✕ 10⁻²⁷ kg. Assume the cross-sectional area of the laser beam is 6.65 ✕ 10⁻²⁹ m².)
m/s²

^{-75.55 POINTS KATZPSE1 34.P.053. MY NOTES ASK YOUR TEACHER Optical tweezers use light from a laser to move single atoms and molecules around. Suppose the intensity of light from the tweezers is 1000 W/m2, the same as the intensity of sunlight at the surface of the Earth. (a) What is the pressure on an atom if light from the tweezers is totally absorbed? Pa (b) If this pressure were exerted on a helium atom, what would be its acceleration? (The mass of a helium atom is 6.65 x 10-27 kg. Assume the cross-sectional area of the laser beam is 6.65 x 10-29 m2.). m/s2 Need Help? Watch It}

Answer 1

If light totally absorb - Pressure Force Area = Intensity of light speed of light P= 1000 6 3x108 - 6.65 x 10-29 F = 6.65*10-29 x103 3x108 = 202168 10-34 N From Newton's and how of motion F= mxa = 2.216 *10-34 G: 65 x 10^1 x2 = 2.916 X 10-3 a = 2.216 x 10-34 6.65810-27 a = 0-333 *10-7 m/s2 p= 10% = 3.33 x 10-6 3x108 P = 3.33*106 N/m2 m/s2 acceleration, a = 0.333 x 10