Light travels fastest in

Correct Answer: 8

Explanation:

The easiest way would measure it through half a liter water bottle. There are approximately 16.9 ounces(oz) of water in a 500ml water bottle.

 

Gallon is an imperial customary volume unit for the U.S.

 

As we have previously mentioned, the 16.9oz bottle is also known as 500ml in the metric system. According to U.S. standard, 1 gallon stands for 128 fluid oz.

 

Hence, Number of bottles in 1 gallon = 128/16.9 = 7.57 =~ 8.

Correct Answer: Glass

Explanation:

Sound is a mechanical vibration and needs a medium for propagation. The higher the density of the medium, the faster the sound travels. So, sound cannot travel through vacuum.

 

As the sound travels faster in solids than liquids and gases, sound travels faster in the glass than Air and water.

Correct Answer: PWC refers to Personal Water Crafts To control steering on a PWC, the most needed requirement is to have power in which will allows the one using it to control the engine for it to stop or for it to move Without power, the person using it could be out of balance or fail to start the engine This is the basic requirement because even though it is shut off or the engine is off, the PWC is still on and it could still move without proper knowledge of the engine

Correct Answer: Proton

Explanation:

Protons carry a positive electrical charge, electrons carry a negative electrical charge and neutrons carry no electrical charge at all. The protons and neutrons cluster together in the central part of the atom, called the nucleus, and the electrons 'orbit' the nucleus.

Correct Answer: Resistivity : Resistivity is a measure of the resistance to the flow of electrons Conductivity : Conductivity is just the inverse of resistivity, ? = 1/?, where ? is conductivity and ? is resistivity Example: Think of a pipe and water, the bigger the pipe, the easier water can flow and thus the lower the resistance

Correct Answer: < 85 db

Explanation:

Sound intensity or level is measured by a unit called a decibel. An 85 decibel noise level is not a safe standard for the public.

 

Hence, Acceptable noise level for human ear is less than 85 db.

Correct Answer: Specific Heat formula

Explanation:

Q = mc?T refers to Specific Heat formula.

 

When heat energy is added to a substance, the temperature will change by a certain amount.

The relationship between heat energy and temperature is different for every material, and the specific heat is a value that describes how they relate.

 

Q = mc?T

 

Q = heat energy (Joules, J)

m = mass of a substance (kg)

c = specific heat (units J/kg?K)

?T = change in temperature (Kelvins, K)

Correct Answer: Vacuum

Explanation:

A Sound wave needs a medium for propogation. Hence, Sound cannot travel through a vacuum.

A vacuum is an area without any air, like space. So sound cannot travel through space because there is no matter for the vibrations to work in.

Correct Answer: Radio waves

Explanation:

Radio waves have much longer wavelengths and lower frequencies than do visible light waves. In contrast, X-rays have much shorter wavelengths and higher frequencies. 

Ultraviolet Light (UV). part of the electromagnetic spectrum that consists of waves with frequencies higher than those of visible light and lower than those of x-rays.

Correct Answer: Specific heat

Explanation:

The usual cause of sea breeze is the difference in specific heat capacity between land and water Land heats and cools more quickly than water.

 

What is the cause of a sea breeze?

The air over the land is warmed and rises, to a greater temperature than that over the sea. This produces a convection current, with cooler air flowing in from over the sea to replace that rising from the land. At night the land cools more than the sea, so the action reverses to produce a land-breeze, blowing off the land.