Compare the energy required to warm 1kg of water from 0ºc to 100ºc, to energy required to turn 1kg of water from liquid to vapor at 100ºc. a) warming the water requires more energy
b) vaporizing the water requires more energy
c) both processes require the same amount of energy

The correct answer is Option a.

Explanation:

To calculate the amount of heat absorbed, we use the equation:

where,

= amount of heat absorbed = ?

= specific heat capacity = 4.186 J/g °C

m = mass of water = 1 kg = 1000 g    (Conversion factor: 1 kg = 1000 g)

= final temperature =

= initial temperature =

Putting all the values in above equation, we get:

To calculate the amount of heat released, we use the equation:

where,

= amount of heat absorbed = ?

m = mass of water = 1 kg

= latent heat of vaporization = 2260000 J/kg

Putting all the values in above equation, we get:

From the calculations above, we get that

So, the warming of water requires more energy.

Hence, the correct answer is Option a.

answer: b.

explanation:

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia