Question

An isotropic point source radiates 1.6 x103 w find the average intensity (pointance) in [w/sr]

An isotropic point source radiates 1.6 x103 w find the average intensity (pointance) in [w/sr]

Homework Answers

Answer #1

Required Definition:

Pointance is defined as the power radiated (P) per unit solid angle. i.e, the intensity (I) is given by -

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A point source whose intensity is 1 W/sr is located 25 cm from a 10-cm focal...
A point source whose intensity is 1 W/sr is located 25 cm from a 10-cm focal length lens with a 5-cm diameter. What is the image intensity? What is the irradiance at the center of a screen (a) 10 cm from the lens in object space (b) 25 cm from the lens in image space (c) 10 cm from the lens in image space
Chapter 17, Problem 095 The sound intensity is 0.0070 W/m2 at a distance of 13 m...
Chapter 17, Problem 095 The sound intensity is 0.0070 W/m2 at a distance of 13 m from an isotropic point source of sound. (a) What is the power of the source? (b) What is the sound intensity 6.3 m from the source? (c) What is the sound level 13 m from the source?
The light intensity a certain distance away from a spherically-symmetric light source is 1200 W/m2. What...
The light intensity a certain distance away from a spherically-symmetric light source is 1200 W/m2. What would be the new intensity (in W/m2) if the source power were tripled while the observation point is made to be five times farther from the source? A. 156 B. 975 C. 144 D. 245 E. None of these
The light intensity 10 [m] from a point source radiating uniformly in all directions is 1000...
The light intensity 10 [m] from a point source radiating uniformly in all directions is 1000 [W/m2]. The intensity 100 [m] from the same source is:___________ Please include formulas used and show all work thanks!
What is the relationship between intensity and distance from a point source? Why should this be...
What is the relationship between intensity and distance from a point source? Why should this be the cast? (Hint: think of the point source as being at the center of the sphere. How are the area of this sphere and the intensity of light related? It might help you to realize that no matter how far away you are the toal power output from the point source is the same. In other words, if you enclose a 50W light bulb...
A 100-W incandescent lightbulb radiates visible light at a rate of about 10.0 W; the rest...
A 100-W incandescent lightbulb radiates visible light at a rate of about 10.0 W; the rest of the EM radiation is mostly infrared. Assume that the lightbulb radiates uniformly in all directions. Under ideal conditions, the eye can see the lightbulb if at least 20.0 visible photons per second enter a dark-adapted eye with a pupil diameter of 7 mm. Estimate how far from the source the lightbulb can be seen under these rather extreme conditions. Assume an average wavelength...
At a distance of 13.0 m from a point source, the intensity level is measured to...
At a distance of 13.0 m from a point source, the intensity level is measured to be 65 dB. At what distance from the source will the intensity level be 32.5 dB?
A submarine uses sonar (sound pulses) to locate objects. The sub radiates the sound like a...
A submarine uses sonar (sound pulses) to locate objects. The sub radiates the sound like a point source in all directions at a power of 700 W and there are no losses. (give units in all answers) a) What is the sound intensity impinging on an object at a 150 m distance? Answer: 2.476 mW/m2 b) What is the ‘sound intensity level’ measured at a distance of 150 m? Answer: 93.94 dB c) The sub reflects power like a flat...
a) You stand 11.3 m away from an isotropic point source of light and measure the...
a) You stand 11.3 m away from an isotropic point source of light and measure the light’s electric field amplitude to be 2.4 V/m. What total power is the source emitting? Express your answer in watts. b) The electric field in an electromagnetic wave traveling in vacuum has the following wave function: Ey = (3.1 V/m) sin⁡[(1.7 × 106 rad/m)z + ωt]. What is the frequency of the wave? Express your answer in THz (terahertz). Tera- is 1012.
1) The average intensity of electromagnetic waves at a certain point is 500 W/m2. What is...
1) The average intensity of electromagnetic waves at a certain point is 500 W/m2. What is the amplitude of the wave's electric field. a. 265 V/m b. 449 V/m c. 614 V/m d. 736 V/m 2) What is the radiation momentum density of an electromagnetic wave having an electric field amplitude of 1000 V/m and travelling in a vacuum? a. 4.07 x 10^-15 kg m-2 s-1 b. 9.28 x 10^ -15 c. 1.48 x 10^-14 d. 6.25 x 10^-13 3)...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT