A 075-mw laser emits a narrow beam of light that enters the, Ask an Expert

Academics

A 0.75-mW laser emits a narrow beam of light that enters the eye, as shown in the figure.

(a) How much energy is absorbed by the eye in 0.2 s?

(b) The eye focuses this beam to a tiny spot on the retina, perhaps 6.0 m in diameter. What is the average intensity of light (in W/cm²) at this spot?

(c) Damage to the retina can occur if the average intensity of light exceeds 1.0 x 10^-2 W/cm². By what factor has the intensity of this laser beam exceeded the safe value?

View complete question

Physics, Academics

Category:- Physics
Reference No.:- M9998827

Have any Question?Write your Review or question?

Related Questions in Physics

Question a plastic rod is charged to -20 by rubbinga have

Question: A plastic rod is charged to -20 by rubbing. a. Have electrons been added to the rod or protons removed? Explain. b. How many electrons have been added or protons removed? The response must be typed, single spac ...

An object falls because of gravity at a rate of -980 cms2 -

An object falls because of gravity at a rate of -980 cm/s2 (- sign is indicative of a downward direction) for 10. seconds. If it starts from rest (vo = 0) and its position starts from do= 0.0, where is it 10. seconds lat ...

Question a parallel-plate air capacitor has a capacitance

Question: A parallel-plate air capacitor has a capacitance of 920 pF. The charge on each plate is 3.90 ÎC. What is the potential difference between the plates? Express your answer with the appropriate units. Part B If th ...

Question three odd-shaped blocks of chocolate have the

Question: Three odd-shaped blocks of chocolate have the following masses and center-of-mass coordinates: (1) 0.300kg , (0.300 m, 0.300 m); (2) 0.400kg , (0.200 m, -0.400 m); (3) 0.200 kg , (-0.300m , 0.600 m). Find the x ...

Question a somewhat idealized graph of the speed of the

Question: A somewhat idealized graph of the speed of the blood in the ascending aorta during one beat of the heart appears as in the figure Part A: Approximately how far, in cm, does the blood move during one beat? Part ...

Question it is proposed that future space stations create

Question: It is proposed that future space stations create an artificialgravity by rotating. Suppose a space station is constructed as a1000-m-diameter cylinder that rotates about its axis. The insidesurface is the deck ...

Question one day when you come into physics lab you find

Question: One day when you come into physics lab you find several plastic hemispheres floating like boats in a tank of fresh water. Each lab group is challenged to determine the heaviest rock that can be placed in the bo ...

Suppose that your users manual lists your cars weight at

Suppose that your user's manual lists your car's weight at 2800 pounds, and you calculate a weight of 2900 pounds based on measurements of the car's tire areas and pressure. What is the percent error between your experim ...

You throw two balls of equal masses m0992 kg vertically

You throw two balls of equal masses ( m =0.992 kg) vertically upward at an interval of Δ t = 1.41 seconds with the same initial speed of v i=35.3 m/s from the same height. At what height will they collide, measured rel ...

Question when striking the pike a predatory fish can

Question: When striking, the pike, a predatory fish, can accelerate from rest to a speed of 3.9m/s in 0.12s . a) What is the acceleration of the pike during this strike? Express your answer using two significant figures. ...

4,153,160 Questions Asked
13,132 Experts
2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

Recent Questions

Ask Physics Expert