Which two heart sounds are heard through the stethoscope when placed on the chest ?When are these sounds produced respectively?

Name two heart sounds.

Which instrument is employed to hear the heart sounds?

Sound is produced when objects………..

What is the nature of thermal changes in air when sound propagates through air?

Name the organ which produce sound.

Which sound is produced by musical instruments?

Name two heart sounds and mention when they are respectively produced in cardiac cycle.

A stone dropped from the top of a tower of height 300 m high splashes into the water of a pond near the base of the tower. When is the splash heard at the top given that the speed of sound in air is 340 m s^-1 ? (g = 9.8 m s^-2)

Which type of chemical reactions take place when Limestone is heated.