If we compare and contrast electromagnetic waves with sound eaves, but all but one statement is true. that is

Two particles of masses m and 2m are placed on a smooth horizontal table. a string, which joins these two masses, hangs over the edge supporting a pulley, which suspends a particle of mass 3m. the pulley has negligible mass. the two parts of the string on the table are parallel and perpendicular to the edge of the table. the hanging parts of the string are vertical. find the acceleration of the particle of mass 3m.

What are atoms of the same element with varying number of neutrons

Apersons beliefs and general outlook, which act like filters on the information they receive are called ?