Which frequency is used by elephants to communicate with each other:
Zero frequency
Low frequency
Medium frequency
High frequency
Which is the most suitable means of reliable continuous communication between an orbiting satellite and earth:
Mecrowaves
Radio waves
Sound waves
Any light waves
The intensity level of whispering is:
20 dB
30 dB
40 dB
50 dB
Frequency of tuning fork depends upon its …………. of prongs:
The speed of sound in iron at 25°C is:
5950 m/sec
5900 m/sec
6950 m/sec
6940 m/sec