suppose that you look into a photometer's eyepiece and the fluorescent disks appear to be equal in intensity. If the distance between the photometer to lamp 1 is 400mm, the distance between the photometer to lamp 2 is 200 mm, and the intensity of lamp 2 is known to be 15 candelas, what is the intensity to lamp 1?

Answers

Answer 1

Answer: Use the Inverse square law, Intensity (I) of a light is inversely proportional to the square of the distance(d).

I=1/(d*d)

Let Intensity for lamp 1 is L1 distance be D1 so on, L2 D2 for Intensity for lamp 2 and its distance.

L1/L2=(D2*D2)/(D1*D1)

L1/15=(200*200)/(400*400)
L1=15*0.25
L1=3.75 candela

Related Questions

How long would it take a sound wave from a car alarm to travel 1 km if the temperature is 0 degrees Celsius
An alpha particle is identical to a(n) _____.electron electromagnetic wave helium nucleus uranium nucleus
a bullet is fired upwards with the initial velocity of 250m/s. determine the time taken to reach the maximum height
A moving car has momentum. If it moves twice as fast what is it's momentum
Which of the following is most closely related to an activated complex?a. rate limiter b. energy barrier c. collision group d. transition state

How can researching travel time, routes and weather conditions benefit drivers who are planning a road trip?

Answers

Explanation:

They will be alerted of the traffic conditions. They can choose the route according to the weather condition. They will be aware if there is any road construction going on or accident happened. These awareness will save their time and avoid delays. their journey can be more comfortable and less trouble some.

Explanation:

Researching these options time, routes and weather conditions and even more gives the driver ample information about the journey, and places the driver in better position for decision making, with this information and data afore hand he can decides the best route to take should there be any gridlock, he even decides where or not to embark on the journey based on the prevailing weather conditions,

Regarding time of the journey he is well disposed for proper planning and scheduling.

You are 15.0m from the source of a sound. At that distance, you hear it at a sound level of 20.0dB. How close must you move to the sound to increase the sound level to 60dB?I think its 45.0cm?

15.0cm
45.0cm
55.0cm
60.0cm
85.0cm

Answers

The answer is 45.0cm

Answer:

Explanation:

its 85 cm because it just is in meters it would be .8m which would be decent distance to hear it

In a game of darts, the dart thrower releases the dart directly at the center of the target (the "bull’s eye") with a speed of 13.0 m/s, and the dart strikes the wall, 0.23 m directly below the center of the target. How far from the wall, along the x-axis, was the dart released?

Answers

Answer:2.81 m

Explanation:

Given

speed(u)=13 m/s

dart strikes 0.23 m below

i.e. vertical distance traveled by dart is 0.23 m

considering dart motion similar to Projectile

$h=ut+(at^2)/(2)$

$0.23=0+(9.8t^2)/(2)$

$t=0.216 s$

Horizontal distance travel by dart =u\times t

$=13* 0.216=2.81 m$

A ball rolls from point A to point B. The total energy of the ball at point A isn’t the same as the sum of its potential energy and kinetic energy at point B. Which statement best explains this situation?The rolling ball doesn’t follow the law of conservation of energy.

Some of the ball’s energy is transformed to thermal energy.

The rolling ball loses some of its energy because of gravity.

The ball absorbs some of its own potential energy.

Answers

The rolling ball loses some of its energy because of gravity. Gravity and friction are two factors that slows the acceleration of the ball causing the ball to slow down at point B. If the situation is a free fall, then gravity is a factor, but if it is in a horizontal displacement,then there is friction that counterflows against the applied force.

Some of the ball’s energy is transformed to thermal energy.

Conservation of mechanical energy

The principle of conservation of energy states that sum of potential energy and kinetic energy is constant.

M.A = P.E + K.E

where;

P.E is the potential energy
K.E is the kinetic energy

The mechanical energy is always conserved, although it may be converted from one form to another.

The rolling ball follows the law of conservation of energy, the lost energy may be transformed to thermal energy.

Learn more about conservation of energy: brainly.com/question/166559

Water sticking to the surface of a leaf is an example of ______.

Answers

Water sticking on the leaf is Cohesion Bond

In a generator, mechanical energy is converted into which of the following? A.an electromagnet

B.a moving rod

C.a magnetic field

D.electrical energy

Answers

In an electrical generator, you use steam, water, wind, or
bicycle pedals to turn the shaft, and electricity comes out.

Mechanical energy in ===> electrical energy out.

Answer:

eletrical ENERGY

Explanation:

Other Questions

A child's toy consists of a spherical object of mass 50 g attached to a spring. One end of the spring is fixed to the side of the baby's crib so that when the baby pulls on the toy and lets go, the object oscillates horizontally with a simple harmonic motion. The amplitude of the oscillation is 6 cm and the maximum velocity achieved by the toy is 3.2 m/s . What is the kinetic energy K of the toy when the spring is compressed 5.1 cm from its equilibrium position?Problem-Solving Strategy: Simple Harmonic Motion II: EnergyThe energy equation, E=12mvx2+12kx2=12kA2, is a useful alternative relationship between velocity and position, especially when energy quantities are also required. If the problem involves a relationship among position, velocity, and acceleration without reference to time, it is usually easier to use the equation for simple harmonic motion, ax=d2xdt2=−kmx (from Newton’s second law) or the energy equation above (from energy conservation) than to use the general expressions for x, vx, and ax as functions of time. Because the energy equation involves x2 and vx2, it cannot tell you the sign of x or of vx; you have to infer the sign from the situation. For instance, if the body is moving from the equilibrium position toward the point of greatest positive displacement, then x is positive and vx is positive.IDENTIFY the relevant conceptsEnergy quantities are required in this problem, therefore it is appropriate to use the energy equation for simple harmonic motion.SET UP the problem using the following stepsPart AThe following is a list of quantities that describe specific properties of the toy. Identify which of these quantities are known in this problem.Select all that apply.Select all that apply.maximum velocity vmaxamplitude Aforce constant kmass mtotal energy Epotential energy U at xkinetic energy K at xposition x from equilibriumPart BWhat is the kinetic energy of the object on the spring when the spring is compressed 5.1 cm from its equilibrium position?Part CWhat is the potential energy U of the toy when the spring is compressed 5.1 cm from its equilibrium position?

3) A car company is looking to design an electric car. Which of these would not be a constraint that would limit possible designs? A) Electric cars must be approximately the same size as other cars. B) The company must ensure the cost of the car is not too expensive. C) Electric cars are better for the environment than gas powered cars. D) There are a limited number of types of batteries that can power a car.

Why can't we breath under water?

What is the sequence of the energy transformations that occur in a nuclear reactor