1. Welcome to www.cbselabs.com Forum

Free RD Sharma Solutions from CBSELabs.com

# Recent Content by Vinila Choudary

### when the train is far off but its sound cannot be heard through air. Why

When we put our ear to a railway track, we can hear the sound of an approaching train even when the train is far off but its sound cannot be heard...
Thread by: Vinila Choudary, Mar 23, 2012, 0 replies, in forum: CBSE Class 9 Physics Help

### A powerful sound signal sent from a ship is received again after 2.4 seconds.

[ATTACH]
Thread by: Vinila Choudary, Mar 23, 2012, 0 replies, in forum: CBSE Class 9 Physics Help

### The boy hears the echo of his shout after 4.8 seconds. Find the speed of the sound.

[ATTACH]
Thread by: Vinila Choudary, Mar 23, 2012, 0 replies, in forum: CBSE Class 9 Physics Help

### A sound wave has a frequency 2 kHz and wavelength 40 cm. How long will it take to travel 1.6 km?

A sound wave has a frequency 2 kHz and wavelength 40 cm. How long will it take to travel 1.6 km? [ATTACH]
Thread by: Vinila Choudary, Mar 23, 2012, 0 replies, in forum: CBSE Class 9 Physics Help

### calculate the distance of hill from the boy.

[ATTACH]
Thread by: Vinila Choudary, Mar 23, 2012, 0 replies, in forum: CBSE Class 9 Physics Help

### calculate the wavelength and frequency of new wave.

[ATTACH]
Thread by: Vinila Choudary, Mar 23, 2012, 0 replies, in forum: CBSE Class 9 Physics Help