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IrinaK [193]
3 years ago
7

According to the inverse square law of light, how will the apparent brightness of an object change if its distance to us triples

?
Physics
1 answer:
aleksley [76]3 years ago
4 0
According to the inverse square law of light, <span>apparent brightness will decrease by a factor of 9. Use the formula </span>B=L/(4*pD^2), to check it.
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Let at time t1 means?
Zolol [24]
It means that you note down the observation at time t = t1 of some experiment which you are performing.
7 0
3 years ago
"a horn emits a frequency of 1000 HZ. A 14 m/s wind is blowing toward a listener. What is the frequency of the sound heard by th
Semenov [28]

Answer:

 f_L = 1000 Hz

Explanation:

given,

speed of wind, = 14 m/s

frequency of horn,f_s = 1000 Hz

speed of sound,V = 344 m/s

frequency heard by the listener

using Doppler effect

f_L = \dfrac{v+v_L}{v+v_s}f_s

f_L is the frequency of the sound heard by the listener

f_s is the frequency of sound emitted by the listener

V is the speed of sound

v_L is the speed of listener

v_s is the speed of source

now,

considering the frame of reference in which wind is at rest now, both listener and the source will be moving at 14 m/s

 f_L = \dfrac{v+14}{v+14}\times 1000

now on solving we will get

 f_L = 1000 Hz

hence, the frequency heard by the listener is equal to  1000 Hz

 

7 0
3 years ago
1. If all four switches below are turned on, which light bulb will light up? (W is wood, S is silver, and Yis yarn.)
AleksAgata [21]
The answer to this question is d- circuit D
5 0
3 years ago
Discuss any two current processes that can be used to ensure that there is enough clean water
Tanzania [10]
Two current processes that is used in ensuring that there is enough clean water is maintaining environmental sanitation in communities in which will help promote cleanliness and orderliness and another thing, having people to be educated with cleanliness and proper waste disposal as this will contribute to making the water clean and maintain it that way.
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3 years ago
How long has a victim been dead if his body temperature was 89.2°F?
Zanzabum

Answer: too long lolz

Explanation:

Too long

8 0
3 years ago
Read 2 more answers
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