Tony has 3 sons – Harry, Peter and Murphy. Harry and Peter can complete the work in 24 days and 36 days respectively. In how many days Murphy will complete the work, if Tony could alone complete the whole work in 36/11 days. Tony can do double the work in same time in which all the sons together can complete the work . In how many days Murphy alone can do the whole work?

Lux is the SI unit of -

In a concave mirror which of the following pair of position of object – size of the image is correct?

I. At infinity – point sized

Noise is measured in –

For a non-relativistic particle, the ratio of phase velocity to group velocity of de Broglie waves is:

Sounds of frequencies less than about ______ vibrations per second cannot be detected by the human ear.

What is the maximum value of deforming force upto which a material shows elastic property and above which the material loses it?

From the given options, the speed of sound is highest in which material?

When a forward bias is applied to a p-n junction, it