At what temperature the velocity of sound in air is twice its velocity at `0^@C` ?

At what temperature the velocity of sound will x double of the velocity at 10^@C ?

At what temperature the velocity of sound will increase by 10% of its value at 27^@C ?

What is the velocity of sound in vacuum?

At normal temperature and pressure the velocity of sound in air is 330 m/s . If the temperature increased to 30^@C and the pressure remains the same the velocity of sound in air will be

A train moving with a velocity v is passing a station. A passenger standing on the station notices that the whistle emitted by the train changes its frequency by 50 Hz when it passes him. Given that the frequency of the whistle when the train is at rest with respect to the passenger is 500 Hz and the velocity of sound in air is 330 m/sec, the velocity of the train is

Why the velocity of sound is greater in moist air than dry air?