A point source emits light isotropically (i.e. with the same intensity in all directions). Let I be the luminous intensity at a distance d from the source. The intensity at a distance 2d is equal to: A. 21 B. I C. I/4 O D. 1/2 E. I/16
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- Distances in space are often quoted in units of light years, the distance ugh travels in 1 year. (a) How many meters is a light-year? (b) How many meters is it to Andromeda, the nearest large galaxy, given that it is 2.54106 ly away’ (C) The most distant galaxy yet discovered is 13.4109 ly away. How far is this in meters?A point source emits light isotropically (i.e. with the same intensity in all directions). Let I be the luminous intensity at a distance d from the source. The intensity at a distance 2d is equal to: 4O A. I В. 1/4 OC.I/2 O D.I/16 O E. 21A point source emits light isotropically (i.e. with the same intensity in all directions). Let I be the luminous intensity at a distance d from the source. The intensity at a distance 2d is equal to: 40 A.I О В. 1/4 OC.I/2 O D.I/16 O E. 21
- s New Ro... 2. Calculate travel time of light from the Moon to the Earth (the speed of light in vacuum is 3x10 meters per second; mean distance from the Earth to the moon is 3.84×10° m.Imagine you are at a location where some incident light source provides light at an intensity of 10 W/m^2 Now you move to double your distance from the light source (aka your distance is 2 times its initial value) What is the intensity of the light at this new location (in units of W/m^2, provide only the number)? hp & %23 24 7 8. 3 4. y u e r j k b .. .. * 00 In| : | M?——— A distortion less line has Zp= 60 Q. o = 20 mNp/m, V= 0.6C, where C is the speed of light in a vacuum. Find the Ui.ne parameters R. L G. C. and / at 100MHz.
- 10mW of light with X=628.3nm is sent though a 200µm sheet of substance with 1.6 + i(5 x 10-4). n How much light comes out the other side? (Answer in mW)ست 57°F Sunny Exam in Progress n S When light travels from air into water, + O its velocity and wavelength change, but its frequency does not change. O its wavelength changes, but its velocity and frequency do not change. O its velocity changes, but its frequency and wavelength do not change. O its velocity, wavelength and frequency all change. O its frequency changes, but its velocity and wavelength do not change. 2 3 Q Search 7 R F 11 Il app.honorlock.com is sharing your screen. Stop sharing 99+ 7 G S hp H a Hide BJ W E 10. Three polarizing disks have planes that are parallel and centered on a common axis. The direction of the transmission axis (dashed line) in each case is shown relative to the common vertical direction. A polarized beam of light (with its axis of polarization parallel to the horizontal reference direction) is incident from the left on the first disk with intensity S, = 820 W/m2. Calculate the transmitted intensity if 0₁ = 21.0°, 0₂ = 34.0°, and 03 = 44.0°. X 658.06 W/m² R 92 5 T 6 Horizontal MacBook Air U 8 61
- A signal from of PLDT-Fibr travels through its optic cable at the speed of (2x108 m/s).a.) How long will it take for the signal to travel from our house to LJ’s house which has a30.35 km distance b.) What length in inches of the optic cable represents 0.75 ms(millisecond)?As light travels in an absorbing medium, the rate of decrease in intensity is proportional to the intensity at that point. The intensity as a function of distance traveled in the medium is then O an exponential function of distance. O a sine or cosine function of distance. O proportional to the distance. O proportional to 1/distance.An electromagnetic wave has an oscillating electric field with an amplitude: E(in V/m) = v7i+ Eoyl. The irradiance is found to be 42.5 mW/m2. What is the value of Eoy? (c = 3 x 108 m/s; €, = 8.854 × 10-12 S. I unit) O 15 O 2 O 12 O 13 5.