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Speed of the first train = [450/30] m/sec = 15 m/sec Speed of the second train = [450/45] m/sec = 10 m/sec Speed = (15 + 10) m/sec = 25 m/sec Required time = (450 + 450)/25 sec = 36 sec
Twinkling of the Stars is due to the phenomenon of
Which of the following is a vector quantity?
In which material does sound travel the fastest?
Which of the following is/are NOT scalar quantities?
Which medium cannot propagate sound waves?
With reference to the types of electromagnetic waves, consider the following statements:
(I) Radio waves have the highest wavelength range among ...
______ is an important metal to form amalgam.
The time period of a second’s pendulum is –
What is the speed of light in air?
Temperature of the Sun is measured by___________