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.

well, you would divide 135 by 33 to get your answer. then that is how many seconds it would take. boardman should fly about 132 m or 4.090909090909091 seconds.

scattering of light by tiny particles in air to produce the colors we see on sky, is dependent on the following factors:

(i) wavelength of light

(ii) size of the scattering particle  

(iii) distance traveled by light through the atmosphere.

according to rayleigh's law of scattering, the amount of scattering is inversely proportional to the fourth power of its wavelength. shorter the wavelength, greater is its scattering. hence violet/blue light is scattered more than red.

sun's light is a composite light ( visible light) with wavelengths in the range 400 nm (violet) to 700 nm (red). as sunlight passes through our atmosphere, the molecules of air scatter light according to their wavelengths. during sunrise and sunset, the sun's position is below the horizon. hence light from the sun travels a greater distance in the atmosphere when compared to its position a noon.

as sunlight enters the earth's atmosphere, blue light is scattered away and at the end of its journey in the sky, only red and orange wavelengths remain in the beam.

hence at sunrise and sunset, the sky appears reddish orange.