Light, like any other form of electromagnetic radiation, decreases in intensity the further it travels from the point of emission. The mathematical relation that describes this is an inverse square- that is to say the intensity of the radiation at distance x is proportional to the reciprocal of the square of x. This describes aggregate behavior. An individual photon or a collimated beam (like a laser) does not decay over distance according to the inverse-square relation, but some other.

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Feb 27, 2022
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**Description :** Is it possible to turn a normal object into a speaker at a far distance?

**Last Answer :** That sounds insane. What made you come up with this question?

**Description :** Why not use Hemp to conquer the greenhouse effect and save the earth?

**Last Answer :** I don’t know! I use hemp (almost) for everything. I also use bamboo for a lot

**Description :** Why do we relate the square of the speed of light in energy?

**Last Answer :** You’re squaring the speed at which light travels, not light itself.

**Description :** (Kindly read the details before answering) How much energy would be actually required for a 1 kg object to reach the speed of light in a vacuum?

**Last Answer :** Infinite. Full stop. Sorry, do not pass Go, do not collect $200.

**Description :** Are incandescent light bulbs being eliminated?

**Last Answer :** not sure, seems LEDs are the wave of the future, but then, LED traffic lights don’t get hot enough to melt off the snow that sticks to them. I wouldn’t worry about it too much yet, even with Obama in power, the tree huggers don’t have the sort of power to ban incandescents.

**Description :** What happens when you place a three way light bulb into a two way socket? Will it work as a Three way?

**Last Answer :** IIRC, only one of the filaments will light, instead of both. I believe it’s the brighter one, based on what happens when you plug a normal bulb into a 3-way socket. Shouldn’t break anything

**Description :** Which energy saving light bulb...

**Last Answer :** Lamp maximum wattage is based on amperage, and probably heat output, although with non-halogen bulbs that's not so much a problem.

**Description :** Is light infinitly heavy?

**Last Answer :** Photons actually have zero mass.

**Description :** Which among the following has the highest flue gas loss on combustion due to Hydrogen in the fuel? a) natural gas b) furnace oil c) coal d) light diesel oil

**Last Answer :** a) natural gas

**Description :** How to Choose an Energy Saving Light Bulb?

**Last Answer :** Popular in Russia Ilyich's bulbs are becoming a thing of the past, giving way to more modern lamps, which, as the name suggests, are designed to help conserve energy. What are their advantages ... light bulb for certain conditions, which will last a long time and will be efficient enough to use.

**Description :** Describe the following energy conservation methods of lighting system. i) By replacing lamp sources ii) Using light control gears.

**Last Answer :** Energy conservation methods of lighting system: i) By replacing lamp sources: Installation of energy efficient fluorescent lamps in place of Conventional fluorescent lamps. Installation of ... (HF) electronic ballasts in place of conventional ballasts which saves energy up to 35%.

**Description :** n a chemical factory where dyes are made, wet cake at 30 OC consisting of 60% moisture is put in a dryer to obtain an output having only 5% moisture, at atmospheric pressure. In each batch about 120 ... dryer and the dryer efficiency is 80%. Latent heat of steam at 4 kg/cm2 is 520 kcal/kg.

**Last Answer :** Given that Qty of material dried per batch - 120 Kgs Moisture at inlet - 60% a. The quantity of moisture removed per batch. Water quantity in a wet batch - 120 x 0.6 = 72 Kgs. Quantity of bone dry ... - 48/0.95 = 50.5 Kgs. Equivalent water in a dry batch - 50.5 - 48 = 2.5 Kgs.

**Description :** A sling psychrometer is used to measure : a) only dry bulb temperature b) only wet bulb temperature c) both a & b d) relative humidity

**Last Answer :** c) both a & b

**Description :** The producer gas basically consists of a) Only CH4 b) CO & CH4 c) CO, H2 & CH4 d) Only CO & H2

**Last Answer :** c) CO, H2 & CH4

**Description :** Which of the following two statements are true regarding application of Kaizen for energy conservation? i) Kaizen events are structured for reduction of only energywastes ii) Kaizen events engage workers in such a way so that they get ... energy use a) ii & iv b) i & iii c) iii & iv d) i & iv

**Last Answer :** a) ii & iv

**Description :** Bio-gas generated through anaerobic process mainly consists of a) only methane b) methane and ca

**Last Answer :** b) methane and carbon dioxide

**Description :** Obtain a relation for the distance travelled by an object moving with a uniform acceleration in the interval between 4th and 5th seconds -Physics 9th

**Last Answer :** Uniform acceleration in the interval between 4th and 5th seconds = = (5u + 1/2 * a * 5^2) - (4u + 1/2 * a * 4^2) = 5u + 1/2 *a * 25 - 4u + 1/2 * a * 16 = u + 1/2 * a * (25-16) = u + 1/2 * a * 9 = u + 9/2 * a If it starts from rest then the displacement will be 9/2a. hope this helps!

**Description :** Numerical Questions and answers on Motion for Class 9 physics a. What is the distance travelled by the SUV is first 2 seconds? b. What is the braking force at the end of 5 seconds to bring the SUV to a stop within one seconds? -Science

**Last Answer :** a. The distance travelled by the SUV is first 2 seconds = Area of ΔABEΔABE =12 AE BE=12 AE BE =12 2 15=15m=12 2 15=15m b. Acceleration will be given by the slope of the line CD a=0−156−5= ... =−15m/s2 Now mass of the SUV =1000 Kg Braking Force will be F=ma=1000 −15=−15000NF=ma=1000 −15=−15000N

**Description :** A train accelerates from 36 km/h to 54 km/h in 10 sec. (i) Acceleration (ii) The distance travelled by car. -Science

**Last Answer :** a. Acceleration is given by a=ΔvΔta=ΔvΔt Δv=54−36=18km/hr=18×10003600m/s=5m/sΔv=54−36=18km/hr=18×10003600m/s=5m/s So a=.5 m/s2 b. Distance is given by S=ut+12at2S=ut+12at2 Now u=36 km/hr =10m/s s=10×10+12×.5×102s=10×10+12×.5×102 So s=125m

**Description :** The work done by a body on application of a constant force is the product of the constant force and distance travelled by the body in the direction of force. Express this in the form of a linear equation in two variables and draw its graph by taking the constant force as 3 units. -Maths 9th

**Last Answer :** Solution :-

**Description :** What is the difference between displacement and distance travelled?

**Last Answer :** What is the difference between displacement and distance travelled?

**Description :** Which of the following are scalars or vectors? Displacements, distance travelled, velocity, speed, force, work done, energy

**Last Answer :** Which of the following are scalars or vectors? Displacements, distance travelled, velocity, speed, force, work done, energy

**Description :** What is the distance travelled by an object over a certain period of time?

**Last Answer :** There are two pieces of data that need to be recorded. The distance and the time it takes to complete the known distance, gives you the speed. For an example, your car travels at a steady 60 miles, in one hour you would expect to have travelled 60 miles.

**Description :** The distance travelled per turn of α-helix in nm is (A) 0.34 (B) 0.44 (C) 0.54 (D) 0.64

**Last Answer :** Answer : C

**Description :** A car travelled south-west for 200 miles depicts A. distance B. speed C. velocity D. displacement

**Last Answer :** displacement

**Description :** Distance travelled by a body in time ‘t’ is A. instantaneous speed B. average velocity C. average acceleration D. instantaneous acceleration

**Last Answer :** average velocity

**Description :** A train travelling at 20 m s-1 accelerates at 0.5 m s-2 for 30 s, the distance travelled by train is A. 825 m B. 700 m C. 650 m D. 600 m

**Last Answer :** 825 m

**Description :** Horizontal distance travelled by a ball if it's thrown with initial velocity of 20 m s-1 at an angle of 30° is A. 24 m B. 56 m C. 35.3 m D. 36.3 m

**Last Answer :** 35.3 m

**Description :** The distance travelled by a moving vehicle during perception and brake reaction times, is known as (A) Sight distance (B) Stopping distance (C) Lag distance (D) None of these

**Last Answer :** Answer: Option C

**Description :** The distance travelled by revolving the wheel of a vehicle more than its circumferential movement, is known as (A) Slip (B) Skid (C) Neither (a) nor (b) (D) Both (a) and (b)

**Last Answer :** Answer: Option B

**Description :** A sample rate of ________is required for a good quality representation of telephone conversation. (A) 4500 times per second. (B) 700 integer sample points per minute. (C) 50 times per second per mile of distance travelled. (D) 8000 times per second.

**Last Answer :** (C) 50 times per second per mile of distance travelled.

**Description :** Rubesh generally takes 80 minutes to reach home from office. Due to rain, he travelled at 2/3rd of his usual speed for the 1st half of the distance. At what speed should rubesh travel the remaining distance ... c) 2.5 times the original speed d) 3 times the original speed e) Cannot reach on time

**Last Answer :** Under the normal speed, 40 minutes for half the distance Due to rain, time taken will be 40 / (2/3) = 40 × (3/2) = 60 minutes So, in 20 minutes he has to cover the distance he usually covers in 40 minutes. So, he has to travel at twice the original speed. Answer: b)

**Description :** The speed of a car increases by 2 kms after every one hour. If the distance travelled in the first one hour was 35 kms, what was the total distance traveled in 12 hours? A.456 kms B.482 kms C.552 kms D.556 kms E.None of these

**Last Answer :** Answer – C (552 kms) Explanation – Total distance travelled in 12 hours = (35 + 37 + 39 + …… upto 12 terms) This is an A.P. with first term, a = 35, number of terms, n = 12, common difference, d =2. Required distance =12/2 (2 x 35 + (12 – 1) x 2) = 6(70 + 22) = 552 kms

**Description :** A train starts from Delhi and reaches Lucknow in 24.5 hours. If it travels the first half of journey at 30 kmph and second half at 40 kmph then what is the total distance it travelled? 1) 750 km 2) 800 km 3) 840 km 4) 900 km 5) 920 km

**Last Answer :** 3) 840 km

**Description :** Anil after travelling 6 km towards East from his house realized that he has travelled in a wrong direction, lie turned and travelled 12 km towards West, turned right and travelled 8 km to reach his office. The straight distance of the office from his house is: (A) 20 km (B) 14 km (C) 12 km (D) 10 km

**Last Answer :** Answer: D

**Description :** In certain city the Taxi charges comprise of a fixed charge and the charge of the distance travelled. A person paid Rs.156 for a journey of 16 km and another person paid Rs.204 for the journey of 24 km. The amount paid by a passenger who has travelled 30 km is (A) 236 (B) 240 (C) 248 (D) 256

**Last Answer :** Answer: B

**Description :** 2 bus start from A & B respectively and travel towards each other at a speed of 150 km/hr and 120 km/hr respectively. By the time they meet, the first bus has travelled by 300km more than the second. The distance between A & B is a) 2700 b) 2800 c) 2750 d) 2457

**Last Answer :** A At the time of meeting, Let the distance travelled by the second bus be xkm Then distance covered by the 1st bus is (x+300)km x/120= (x+300) /150 150x = 120(x+300) 150x = 120x +36000 30x = ... X=36000/30 X=1200 So the distance covered between A & B =(x+x+300) =(1200+1200+300) =2700km.

**Description :** Mr.Aneesh left for city 1 from city 2 at 3.00 pm. He travelled at the speed of 60km/hr for 1 and half hours. After that the speed was reduced to 15 km/hr. If the distance between two cities is 120 kms, at what time did Mr.Aneesh reach city 1 ? a) 6.30 pm. b) 5.30 pm. c) 7.30 pm. d) 8.30 pm.

**Last Answer :** A Mr.Aneesh travelled 60 km/hr for 1 1/2 hours (3/2 hours). Distance covered in 3/2 hours = 60 x 3/2 = 90 km. Therefore, remaining distance = 120 -90 = 30 km After 3/2 hours, the speed was ... village 2 at 3.00 pm + 3 hours 30 minutes = 6.30pm Hence the required answer is 6.30 pm.

**Description :** The speed of a van increases by 5 kmph after every one hour. If the distance travelled in the first one hour was 55 km, what was the total distance travelled in 8 hours? a) 580km b) 116km c) 147km d) 240km

**Last Answer :** A Distance travelled in 1ST hour =55 km Speed of the van increases by 5 kmph after every one hour. Hence, distance travelled in 2nd hour =60 km distance travelled in 3rd hour =65 km and so on Total distance travelled =(55+60+……..+(8 terms)) =8/2(2*55+(8-1)5) =4(110+35) =580km

**Description :** If a house has solar panels and all energy is free, then is it ok to leave the lights on?

**Last Answer :** I think it would be wise to not waste any energy whether it's free or paid. Every electronic item has a limited working lifespan, if you were to run it all the time, it's gonna break very soon. Aside ... then the short answer is Yes . You can waste as much as you want since you own this energy.

**Description :** Why don't they construct giant magnifying lenses to create heat and power?

**Last Answer :** We already do This is probably what you pictured in your head, but it is exactly the same thing on a very large scale. excerpt Creating and storing power was the easy part. Far trickier was finding a way to deal with the stresses created by “radiation fluxes”

**Description :** Is the energy crisis real?

**Last Answer :** Who is calling it a crisis? We have plenty of energy here in the US. OPEC has been aggrresive at limiting supply and raising prices.

**Description :** Why is there such a difference between highway and around town miles per gallon?

**Last Answer :** Yes to starting and stopping. Gas is used to get up to speed; braking slows it down and repeat. Also on the highway you are in the top gear with fewer RPM’s less gas is used.

**Description :** When to use dry batteries, when to use wet batteries, and where do you find them?

**Last Answer :** In many cases, dry cell batteries are not rechargeable, where wet cell batteries are. Dry cell batteries were once used in old telephone systems and wet cell batteries are used in automobiles. ... means of absorbent material -from The New Century Dictionary, 1944 ed. Like a flashlight battery.

**Description :** What branch of science does research into tachyon energy computing ?

**Last Answer :** Right after we reach “the speed of light”. We are close, to speed of light, with the Large Hadron Collider.

**Description :** Is it possible to convert infrared energy into electricity?

**Last Answer :** Silicon solar cells can convert the shorter wavelengths of IR to electricity: https://www.solarquotes.com.au/blog/uv-solar-panels/ You can also concentrate solar IR and use the ... .com/innovationtoronto.com/wp-content/uploads/2015/12/Solar-Thermal-Power-Plant_forcetoknow.com_.jpg?resize=627%2C221

**Description :** Which takes less energy?

**Last Answer :** Send this Q to LuckyGuy!

**Description :** Why is it important to not mix brands of batteries in a device (whatever kind of device)

**Last Answer :** It is the type of battery not the brand. Types of batteries include: Carbon Zinc, Alkaline, Rechargeable Alkaline, Li-Ion or NiCD.

**Description :** Does Isis want to destroy the planet?

**Last Answer :** Your question details are a non sequitor to your question on ISIS. ISIS does not want to destroy the planet, just civilizations that it considers evil. But what the hell does that have to do with renewable energy? Besides, ISIS gets funding from oil sales.

**Description :** Have they successfully converted energy to mass?

**Last Answer :** They?