Which one of the following best represents the ‘standing wave’ state of an electron in a hydrogen atom where the circumference is equal to four wavelengths?

An atom is said to be in an excited state when it has one or more electrons

According to the Bohr model of the atom

When white light is passed through cool gases, the spectra observed are called

The law that states that "the force is directly proportional to the product of charges and inversely proportional to the square of separation between them" is called

The value of the constant “k” in Coulomb's law has value of

For a charge Q1, the effect of charge Q2 on Q1 will be

A charge of 2 X 10^-7 C is acted upon by a force of 0.1 N. Determine the distance to the other charge of 4.5 X 10^-7 C with both the charges in vacuum.

The diagrams below represent 5 different standing sound waves set up inside of a set of organ pipes 1 m long

Coulomb is the unit of which quantity?