Physics, 10.02.2020 20:02 shannydouglas

Two rooms A and B are 12.5m and 25m long in which room u will get the effect echo and why

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Answer from: diego4325

B is the room where you will get t he effect of echo.

Explanation:

The minimum distance required to get the echo effect is 17.2 m.The echo effect is produced when there is a reflection of sound waves. When you say something, the sound waves leave your mouth. It travels a minimum distance, 17.2 m to produce an echo. It hits a hard surface and hence, it bounces back. These sound waves will come back to your ear. So, you could hear what you said a second ago. The velocity of sound waves in dry air is 343 m at 25 degree Celsius temperature.

Answer from: Quest

most voltage drop calculators want the distance between the source and destination. then internally, they double it so both the source and return wires are calculated. but you need to know which distance the calculator uses so you're not half of what you should be or double what you should be.

most circuit breakers will not take a #6 directly, so the electrician will have to splice on a smaller pigtail. you also have to upsize the grounding wire when you upsized the ungrounded (hot) wire (see note in 250.122). this will preclude using most cable assemblies, as a cable with #6 copper will most likely only have a #10 grounding conductor. you need a #6 grounding conductor if the circuit is 20a. a #8 cable is no better, as it will have a #10 grounding conductor too. but most 20a breakers will take a #8 directly.

in your related post, you didn't say what type of load this is. if it is a light or heater, voltage drop won't be a big issue. if this is a motor, the current needs are huge at startup and the voltage drop can pose a problem. if this is a motor, knowing if the motor is under much load during startup will answer the voltage drop effect (a saw is easier to start than a compressor).

Answer from: Quest

at positions a, g kinetic energy is maximum.

at position d, potential energy is maximum.

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Two rooms A and B are 12.5m and 25m long in which room u will get the effect echo and why...

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