The echo (reflected sounD. will be distinctly heard only at ordinary temperatures if the distance of the reflecting surfaces from the source of sound is at least ________?

Related Mcqs:

The protons and neutrons are found in the center of the atom, which is called the _________of the atom?

A. Nucleus B. Headquarters C. Hub D. None of These...

Bromine is a___________________?

A. black solid B. red-brown liquid C. colourless gas D. highly inflammable gas...

Melanoma (skin cancer) is associated with ______________?

A. ozone accumulation B. ozone depletion C. acid rain D. allergens...

An example of an abiotic component __________?

A. Plants B. Soil C. Animals D. Bacteria...

Laughing gas is also called ?

A: Nitrous Oxide B: Dinitrogen Oxide C: Dinitrogen Monoxide D: All of above...