Answer:
1.) 30m/s
2) 5m/s
3) 40Hz
4) 400Hz
5) 300Hz
6) 0.77m
7) 0.386m
8) 0.625m
9) 100m/s
10) 50m/s
Explanation:
The speed of a wave (V) equals :
V = fλ ; where f = frequency, λ = wavelength
1.) f = 100Hz, λ = 0.30m
v = 100 * 0.30 = 30m/s
2) f = 50Hz λ = 0.10m
v = 50 × 0.10 = 5m/s
3) v = 20m/s, λ= 0.5m
f = v / λ
f = 20 / 0.5 = 40Hz
4) v = 80m/s, λ= 0.2m
f = 80/0.2 = 400Hz
5) v = 120m/s, λ = 0.4m
f = 120 / 0.4 = 300Hz
6) v = 340m/s, f = 440Hz
λ = v / f ; 340 / 440 = 0.77m
7) v = 340m/s, f = 880Hz
λ = 340 / 880 = 0.386m
8) v = 250m/s, f = 400
λ = 250 / 400 = 0.625m
9) f = 50Hz, λ = 2m
v = 50 × 2 = 100m/s
10) f = 100Hz, λ = 0.5m
v = 100 × 0.5 = 50m/s
