What do you know about Charles' Law? Check all the statements that are true. For a fixed mass of gas, at a constant pressure, the volume () is directly proportional to the absolute
temperature (1)
Using the example of the sealed cylinder above, the volume of gas at the start is recorded as 30 cm with
a temperature of 30°C. The cylinder is heated further till the thermometer records 60°C. The new volume
of the gas is 32.97 cm3
Heat energy is applied to a cylinder containing a specific volume of gas. The temperature of the gas
increases. The average velocity of the gas particles increases resulting in an increase in the rate of
collisions and the average force per collision. This produces a decrease in pressure inside the cylinder
According to the ideal gas law, increasing the volume of a closed reaction container decreases the thermal
energy because the pressure and collision frequency decrease.
There is no relationship between temperature and volume for gases.

heat the gas and measure the pressure

the entire statement is true and correct.  

there's no diagram, nothing is illustrated, and no question is asked.

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.