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If an object is placed 1 m (3 ft) away from a light source and the lux level is 3200 lux, what is the lux level at a distance of 8 m (24 ft)?
Suggested Answer: A
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If an object is placed 1 meter (3 feet) away from a light source with a lux level of 3200 lux, the lux level decreases according to the inverse square law of light. At a distance of 8 meters (24 feet), the lux level can be calculated as:
NewLuxLevel=3200lux(8/1)2=3200lux64=50luxtext{New Lux Level} = frac{3200 text{ lux}}{(8/1)^2} = frac{3200 text{ lux}}{64} = 50 text{ lux}NewLuxLevel=(8/1)23200lux=643200lux=50lux
Thus, at 8 meters, the light intensity drops significantly to 50 lux.
38 comments · newest first
ST
Stacey
10 months ago
I thought it would be higher, like 200 lux.
IN
Inocencia
11 months ago
Yup, 50 lux makes sense to me!
RE
Renay
11 months ago
Wait, how does it drop so much? Sounds off.
BU
Buck
11 months ago
Definitely going with option A, 50 lux.
TA
Tambra
11 months ago
It's an inverse square law situation!
LO
Lorean
11 months ago
I think I remember that doubling the distance reduces the lux by a factor of four, but I'm not confident about the final answer.
DE
Deandrea
12 months ago
I feel like I might have seen a question like this before, and I think the answer was much lower than 3200 lux at that distance.
RA
Rachael
12 months ago
This seems similar to a practice question we did in class. I think the lux level decreases with distance, but I can't recall the exact calculation.
DE
Denny
1 year ago
I remember something about the inverse square law for light intensity, but I'm not sure how to apply it here.
AA
Aaron
1 year ago
Easy peasy! This is just a matter of plugging the numbers into the inverse square law formula. I've got this one in the bag.
RO
Roxane
1 year ago
Hmm, I'm a bit unsure about this one. I know it has something to do with light intensity and distance, but I'm not confident I can apply the right formula here.
AM
Ammie
1 year ago
This looks like a straightforward inverse square law problem. I'll need to remember the formula and plug in the given values.
SH
Sharee
1 year ago
Okay, let me think this through step-by-step. I know the intensity of light decreases with the square of the distance, so I just need to use that relationship to calculate the new lux level.
CU
Curtis
1 year ago
I'm a bit confused by this question. What exactly do they mean by "business process integration strategy"? And how do the answer choices relate to that? I'll need to review my notes to make sure I understand the concepts before answering.
KI
Kimberlie
2 years ago
This question is brighter than a thousand suns! Just kidding, but really, it's not that hard. The answer is clearly C) 400 lux. I mean, come on, it's not rocket science.
DY
Dylan
2 years ago
I'm sticking with C) 400 lux, it just makes sense.
MA
Mayra
2 years ago
Actually, I'm pretty sure it's A) 50 lux.
TE
Tegan
2 years ago
No way, I believe it's D) 200 lux.
EA
Earleen
2 years ago
I think the answer is C) 400 lux.
NI
Nikita
2 years ago
Wait, what? I thought this was supposed to be a lighting question, not a math problem. Ugh, I guess I'll just have to guess. I'll go with B) 10 lux, because why not?
SC
Scarlet
2 years ago
Easy peasy! Just plug the numbers into the formula and you get the answer. C) 400 lux, no doubt about it.
NO
Noemi
2 years ago
That's correct, just plug in the numbers and you'll get C) 400 lux.
RO
Rosendo
2 years ago
Yeah, it's a simple calculation. C) 400 lux is the lux level at a distance of 8 m.
GA
Gaston
2 years ago
I think you're right, C) 400 lux seems to be the correct answer.
DE
Deeanna
2 years ago
So, the lux level at 8 m would be lower than 3200 lux. I think the answer is B) 10 lux.
ES
Estrella
2 years ago
I agree with Dianne. The lux level will decrease because the light spreads out.
DI
Dianne
2 years ago
I think the lux level will decrease as the distance increases.
YO
Yolande
2 years ago
Woah, this question is a real brain-teaser! I'm gonna have to break out my calculator for this one. Okay, got it - the answer is C) 400 lux.
YV
Yvonne
2 years ago
That was a tricky one, but C) 400 lux makes sense.
CL
Clorinda
2 years ago
I agree, it's definitely C) 400 lux.
AL
Alton
2 years ago
I think the answer is C) 400 lux.
FI
Filiberto
2 years ago
Hmm, I remember learning about the inverse square law in physics. Let's see, if the distance increases by a factor of 8, the intensity should decrease by a factor of 64. So the answer must be C) 400 lux.
LI
Linwood
2 years ago
Great, thanks for explaining the inverse square law!
RO
Rolande
2 years ago
So, the lux level at 8m would be 400 lux.
HI
Hillary
2 years ago
That makes sense, the inverse square law at work!
SH
Shaun
2 years ago
I think you're right, the lux level at 8 m should be 400 lux.
TH
Theodora
2 years ago
That makes sense, the intensity decreases as the distance increases.
HY
Hyman
2 years ago
I think the answer is C) 400 lux.