![cschellfamily](/avatars/2787.jpg)
cschellfamily
03.04.2020 •
Physics
4 points
A luminous source lights up an area 2.0 m away with an illuminance of
100.0 lx. How much will the illumination decrease by if the distance is
doubled? How much will the illumination decrease by if the distance is
tripled?
Solved
Show answers
More tips
- H Health and Medicine Want to Lose Weight? Here s How Many Calories You Need Per Day...
- S Style and Beauty How to Grow Hair Faster: Real Methods and Advice...
- F Family and Home How to Remove Fading from Clothes: Tips and Tricks...
- F Food and Cooking How to Make Polendwitsa at Home?...
- F Family and Home Parents or Environment: Who Has the Most Influence on a Child s Upbringing?...
- P Philosophy Unbelievable stories of encounters with otherworldly forces...
- L Leisure and Entertainment How to Choose the Perfect Gift for Men on February 23rd?...
- H Health and Medicine How to Treat Whooping Cough in Children?...
- H Health and Medicine Simple Ways to Lower Cholesterol in the Blood: Tips and Tricks...
- O Other How to Choose the Best Answer to Your Question on The Grand Question ?...
Answers on questions: Physics
- P Physics Suppose that we use a heater to boil liquid nitrogen (n2 molecules). 4480 j of heat turns 20 g of liquid nitrogen into gas. note that the latent heat is equal to...
- P Physics Determine a valid way of finding the wire’s diameter if you know the resistivity of the material, \rho , and can measure the current flowing through the wire, i,...
- P Physics As part of a circus performance, a man is attempting to throw a dart into an apple which is dropped from an overhead platform. upon release of the apple, the man...
- P Physics An electrical motor spins at a constant 2695.0 rpm. if the armature radius is 7.165 cm, what is the acceleration of the edge of the rotor? a) 28.20 m/s^2 b) 572,400...
- P Physics An ideal gas is maintained at a constant pressure of 70,000 pa during an isobaric process and its volume decreases by 0.2m^3. what work is done by the system on its...
- P Physics When the car carrying the unbelted driver crashes, what brings the driver to a stop...
- P Physics Define the following:GasFluidityLow...
- M Mathematics ANALYZE Consider rectangle QRST with QR=ST=4 centimeters and RS=QT=2 centimeters. If point U is on QR⎯⎯⎯⎯⎯ such that QU=UR and point V is on RS⎯⎯⎯⎯⎯ such that RV=VS...
- M Mathematics Use rounding or compatible number to estimate the sum...
- B Biology When an athlete began running both her breathing and heart rates increased.the athlete’s breathing and heart rates increased as she was running because the athlete...
Ответ:
(a) 25lx
(b) 11.11lx
Explanation:
Illuminance is inversely proportional to the square of the distance.
So,
where, k is a constant
So,
(a)
If I = 100lx and r₂ = 2r Then,
Dividing both the equation we get
When the distance is doubled then the illumination reduces by one- fourth and becomes 25lx
(b)
If I = 100lx and r₂ = 3r Then,
Dividing equation 1 and 3 we get
When the distance is tripled then the illumination reduces by one- ninth and becomes 11.11lx
Ответ:
its keeps the fur straightim kinda confused with the question
Explanation: