Answer : The correct option is, (A) Aluminum foil
Explanation :
Penetration power : It is the movement of particles or the ray through an object. As we know that the more the energy of a particle, the more will be the penetrating power.
The ascending order of the penetration power of alpha rays, beta rays, and gamma rays are:
Alpha rays < Beta rays < Gamma rays
The penetrating power of the alpha, beta and gamma rays varies greatly. That means,
- The alpha particles are restricted by paper.
- The beta particles can pass through the paper but it can not pass through the aluminum foil.
- The restriction of gamma rays is very difficult. It can be restrict or blocked only by concrete, lead, or other heavy shielding.
Hence, Aluminium foil will stop beta particles.
Answer:
A solution of Proponic acid is <u>more acidic </u>than ethanol
The Boiling point of propanoic acid is more than ethanol
Explanation:
1.The boiling point of propanoic acid is more than the boiling point of ethanol because of H- bonding.
The electronegative O atom having the lone pair attracts the H of other molecule. Hence the molecules of ethanol show strong<u><em> intermolecular H-Bonding.</em></u>
CH3CH2OH-------OHCH2CH3
But in Propanoic acid CH3CH2COOH
This has more extensive H- bonding Because here H-bonding occur from two Oxygen atoms . One is C=O oxygen and other is -OH oxygen.
2.Propanoic acid is more acidic than ethanol because it has acidic Hydrogen . The anion formed after the removal of Hydrogen from Propanoic acid is stabilized by resonance but this does not occur in alcohol. look at the resonance of COO- of carboxylic acids;
Well when an object floats, a force pushes up on the object. The force then acts against the downward force of gravity. Which is called the buoyant force.( 8.8.c) The buoyant force on an object in a fluid is an upward force equal to the weight of the fluid the object has displaced.