Answer:
2. depends on both the wavelength and frequency of light.
Explanation: Speed of light(v)=wavelength×Frequency.
∴speed of light depends on both wavelength and frequency as shown from the equation above.
Just to make it easier on you It’s C.Pressure
Answer:
D. 
Explanation:
The speed of sound in dry air is given approximately by
Answer:
C. It triples in magnitude (PLATO)
Answer:
35%
Explanation:
Given data
Amount of energy transferred (Input) = 270J
Amount of energy converted to sound (Output)= 94.5J
Efficiency = output/input*100
Efficiency= 94.5/270*100
Efficiency=0.35*100
Efficiency=35%
Hence the efficiency is 35%
