Answer:
a has a faster period
Explanation:
Period only depends on the length, irrelevant to the mass.
a has a shorter length, so has a small period, or faster.
This is due to the Doppler effect. The position you are in regard to the sound wave causes a change in the amplitude which affects frequency and moves the pitch up
Answer:
Time = 2758.62 seconds
Explanation:
Given the following data;
Speed = 290 m/s
Distance = 800 km to meters = 800 * 1000 = 800000
To find the time;
Time = distance/speed
Time = 800000/290
Time = 2758.62 seconds
Therefore, it will take the pilot 2758.62 seconds to reach the airport.