In biophysics experiments it is common to attach molecules to small plastic spheres with 500 nm...
In biophysics experiments it is common to attach molecules to small plastic spheres with 500 nm radii (r = 5.0 ∗ 10−7m), and then use radiation pressure from a focused laser beam to push or pull on the spheres. If I want to produce a force of 10 picoNewtons (10−11N), and my laser is producing 60 milliWatts of power, what should the radius of the focused laser beam be?
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In biophysics experiments it is common to attach molecules to
small plastic spheres with 500 nm...
A small laser emits light at power 3.11 mW and wavelength 486 nm. The laser beam...
A small laser emits light at power 3.11 mW and wavelength 486 nm. The laser beam is focused (narrowed) until its diameter matches the 1236 nm diameter of a sphere placed in its path. The sphere is perfectly absorbing and has density 3.00×103kg/m3. What is the beam intensity at the sphere's location? Tries 0/10 Calculate the radiation pressure on the sphere. Tries 0/10 Calculate the magnitude of the corresponding force. Tries 0/10 Calculate the magnitude of the acceleration that force...
Experiments using "optical tweezers" measure the elasticity of individual DNA molecules. For small enough changes in...
Experiments using "optical tweezers" measure the elasticity of individual DNA molecules. For small enough changes in length, the elasticity has the same form as that of a spring. A DNA molecule is anchored at one end, then a force of 1.5 nN (1.5 times 10^-9 N) pulls on the other end, causing the molecule to stretch by 5.0 nm (5.0 times 10^-9 m),as shown in the figure.(p.s. The source of the external force is the laser beam that traps and...
Experiments using "optical tweezers" measure the elasticity of individual DNA molecules. For small enough changes in length, the elasticity has the same form as that of a spring. A DNA molecule is anchored at one end, then a force of 1.5 nN (1.5 times 10^-9 N) pulls on the other end, causing the molecule to stretch by 5.0 nm (5.0 times 10^-9 m),as shown in the figure.(p.s. The source of the external force is the laser beam that traps and...
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