Explanation: Most communication waves cannot transmit data accurately over long distances due to the curvature of the earth. They can only do so in the line of sight. However, they are not reflected by the ionosphere like radio waves and can be relayed to a wide area using geostationary satellites.

1. The change in velocity of an object at equal time intervals is called uniform acceleration.

2. A freely falling object is an example of uniform acceleration.

A real gas can behave as an ideal gas if volume of molecule is negligible and interaction between molecule is negligible. This will happen if number of molecule per unit volume is very small. This is only possible at high temperature and low pressure.

The Degree of dissociation does not depend on catalyst.The equivalent conductivity of 0.1M weak acid is 100 times less than that at infinite dilution.

An electric dipole always experiences a torque when placed in uniform as well as non-uniform electric field. But in non-uniform electric field, dipole will also experience net force of attraction. So the electric dipole in non-uniform electric field experiences both torque and force.

The correct order of radiations is in descending order of frequencies.

 X-rays > Infrared > Microwaves > Radio waves