Which of the following statements regarding optical traps is/are true? A light source with an intensity...

Which of the following statements regarding optical traps is/are true?

A light source with an intensity characterized by a uniform cross-section is required.

The name is actually a misnomer because light is not actually being used to generate the trapping forces.

Changes in momentum of the photons result in changes in momentum of a dielectric sphere when it is in the trap.

Optical traps typically generate forces on the order of nanoNewtons.

Expert Solution

1. optical traps use a highly focused laser beam of gaussian intensity profile whose cross section of intensity profile is not uniform. statement 1 is FALSE

2. Light in the form of laser is used. statement 2 is FALSE.

3. Incoming photons that are scattered or absorbed by the dielectric particles transfers part of their momentum into the dielectric particles. this is known as scattering force. As we know that Force is, by definition, the change of momentum in time, hence statement 3 is TRUE.

4. Dielectric particles which the optical trap intrument has to deal with are very small ( in order of micro or nano meters). Obviously the force exerted on such objects must also be very small. Statement 4 is TRUE

genius_generous answered 2 years ago

Which of the following statements are true regarding sponges?

QUESTION 3 Which of the following statements are true regarding sponges? Sponges live in marine or freshwater environments. All sponges are photosynthetic. Adult sponges are non-motile Sponges do not have true tissues. QUESTION 4 Which of the following statements are true regarding arthropods. Similar to the earthworm, an arthropod has a body composed of repeated segments Arthropods have an exoskeleton Arthropods have a coelom Arachnids, crustaceans and insects are all arthropodsQUESTION 5 What are the four basic types of tissues found in animals? tracheid muscle tissue connective tissue epithelial tissue mesophyll nerve tissue

Which of the following statements regarding critical paths is true?

Which of the following statements regarding critical paths is true? A. On a specific project, there can be multiple critical paths, all with exactly the same duration. B. The duration of the critical path is the average duration of all paths in the project network. C. Every network has only one critical path. D. Some activities on the critical path may have slack. E. The shortest of all paths through the network is the critical path.

Which of the following statements are true regarding chemical reactions? T = true and F =...

Which of the following statements are true regarding chemical reactions? T = true and F = false. A) the more negative the ΔG, the further towards completion the reaction will proceed before equilibrium is reached. B) only a system not at equilibrium can perform work. C) for most biochemical reactions in a metabolic pathway, equilibrium is rarely reached. D) in a closed system, a chemical reaction will proceed spontaneously until the reactants and products are in equal concentration.

Which of the following statements is TRUE regarding CAPM? A) This is a model for relating...

Which of the following statements is TRUE regarding CAPM? A) This is a model for relating unsystematic risk to the expected return on a risky asset B) Ceteris paribus, stocks with higher betas should have lower prices. C) The beta for the market is always zero. D) Stocks with higher market risk should have lower expected or required rates of return. Albert purchased Southern Industries stock for $40 per share and sold it one and one half years later for...

3. Which of the following statements regarding liquidity and profitability is not true? a. If a...

3. Which of the following statements regarding liquidity and profitability is not true? a. If a business is unable to pay its debts as they come due, it is operating unprofitably b. In order to survive in the long run, a business must both remain liquid and operate profitably c. A business may operate profitably, yet be unable to meet its obligations d. A business may be liquid, yet operate unprofitably for several years

Which of the following statements regarding t and z distributions is/are true? Correctany false statements to...

Which of the following statements regarding t and z distributions is/are true? Correctany false statements to make them true. A) The area under a t-distribution to the left of -1.97 is greater than the area to the right of 2.17 for a sample of any size. B) The area under the curve (AUC) to the right of t=2.00 when n=15 is smaller than the AUC to the right of t=2.00 when n=50. C) The t-curve has thinner tails and a...

Which of the following statements are true regarding municipalbonds?I) A municipal bond is a...

Which of the following statements are true regarding municipal bonds?I) A municipal bond is a debt obligation issued by state or local governments.II) A municipal bond is a debt obligation issued by the federal government.III) The interest income from a municipal bond is exempt from federal income taxation.IV) The interest income from a municipal bond is exempt from state and local taxationin the issuing state.A) I, II, and III onlyB) I, III, and IV onlyC) I and IV onlyD) I...

a. Which of the following statements is true regarding disability income insurance? why?

a. Which of the following statements is true regarding disability income insurance? why?A.Increasing the elimination period reduces the premium for disability income insuranceB.Disability income insurance usually replaces 100 percent of lost incomeC.A uniform definition of disability appears in all disability income policiesD.The purchase of disability income insurance is not necessary if you are covered under workers compensationb. Under many cafeteria plans, employees make premium contributions with pre-tax dollars and a salary reduction that are used to purchase group health insurance...

Which of the following statements regarding the heat transfer in a PWR are true? The single...

Which of the following statements regarding the heat transfer in a PWR are true? The single phase coolant enters the core with fixed temperature and high pressure (15.5 MPa) and it is heated up by fission heat by about 33 K As the heated-up coolant leaves the core, it is passed into the turbine. The water in the secondary side of the steam generator is heated up by the coolant in the primary loop until boiling

Which of the following statements is true regarding a bond? a.A bond is a certificate that...

Which of the following statements is true regarding a bond? a.A bond is a certificate that acts as evidence of ownership in a corporation. b.Bondholders receive dividends semiannually. c.A bond is a certificate that represents a corporation's promise to repay a certain amount of money and interest in the future. d.If you buy a bond from a company, you are borrowing money from the company.

Question