Sound intensity is high at dead spots while it is low at sound foci.

Colouring of sound quality is caused due to _____

The recommended volume for a public lecture hall is _______

The rate of flow through an opening due to the wind blowing on the wall containing it is given by the expression _______

For working a temperature of 21 degree Celsius, range of 30% to 70% of ________ is desirable.

Ventilation arising from the temperature difference between outside and inside takes place due to ________ effect.

The intensity of sound depends on the ear of the listener.

The speed of sound is taken as ______