Assertion A A jet aircraft moving at mach 1 travels faster at an altitude of 15 km than while moving...........

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Assertion (A): A jet aircraft moving at mach 1 travels faster at an altitude of 15 km than while moving at mach 1 near the sea level.

Reason (R): The velocity of sound depends on the temperature of the surrounding medium.

Codes

Both A and R are individually true and R is the correct explanation of A

Both A and R are individually true and R is not the correct explanation of A

A is true but R is false

A is false but R is true

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Explanation:

jet aircraft (or simply jet) is an aircraft (nearly always a fixed-wing aircraft) propelled by jet engines (jet propulsion).Whereas the engines in propeller-powered aircraft generally achieve their maximum efficiency at much lower speeds and altitudes, jet engines and aircraft achieve maximum efficiency (see specific impulse) at speeds close to or even well above the speed of sound. Jet aircraft generally cruise at faster than about M 0.8 (609 mph, 981 km/h or 273 m/s) at altitudes around 10,000–15,000 metres (33,000–49,000 ft) or more.