As we go higher, the density of air increases and hence pressure decreases

As we go high in the mountains the atmospheric pressure decreases. "___________"

(A): Compression and rarefaction involve changes in pressure. (R): When particles are compressed, density of medium increases and when they are rarefied, density of medium decreases

Suppose the density of air at Madras is rho_0 and atmosphere pressure is P_0. If we go up the density and the pressure both decreae. Suppose we wish to calculate the pressure at a height 10 km above Madras. Ilf we use the equation P_0-P=rho_0gz will we get a pressure more than the actual or less than the actual? Neglect the variation in g. Does your answr change if you also consider the variation in g?

Which of the following statements is true about the variation of density of elements in the periodic table? (A)In a period from left to right density first increases upto the middle and then starts decreasing (B)In a group on moving down the density decreases from top to bottom. (C)A less closely packed solid has higher density. (D)Density of elements is not a periodic property.

Speed of sound waves in air a) is independent of temperature b) increases with pressure c) increases with increase in humidity d) decreases with increase in humidity.

Will the kinetic energy of molecules increase, decrease or remain same if : (i) the temperature is increased ? (ii) the pressure is decreased ? (iii) the volume is decreased ?

As we move down the group, the atomic size increases or decreases ?

As we go higher, what happens to the atmospheric pressure?

Consider the following statements: Assertion (A) The velocity of sound in air increases due to the presence of moisture in it. Reason (R ): The presence of moisture in air lowers the density of air. Of these statements-

Why is it that while going from Hf to Au, the m. pt. first increases upto tungsten and then decreases ?