Answer:
0.017 m
Explanation:
Wavelength: This can be defined as the distance covered in one complete oscillation by a wave. The S.I unit of wave length is meter (m).
The expression for wave length is given as
v = λf ............................... Equation 1
Where v = speed of sound in air, λ = wave length of sound, f = frequency of sound.
make λ the subject of the equation,
λ = v/f ............................... Equation 2
Given: v = 340 m/s, f = 20000 Hz
Substitute into equation 2
λ = 340/20000
λ = 0.017 m.
Hence the wave length of sound in air = 0.017 m
Gravity
Explanation: ree fall is a special type of motion in which the only force acting upon an object is gravity. Objects that are said to be undergoing free fall, are not encountering a significant force of air resistance; they are falling under the sole influence of gravity.
It’s a dynamic load.
Hopes this helps :)
