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Answered

  1. In which medium does sound travel the fastest?
Asalt water
Bfresh water
Cair
Dcast iron

  1. A wave has a wavelength of 10 mm and a frequency of 5 hertz. What is its speed?
A50 mm/s
B50 hertz/s
C2 mm/s
D0.50 mm/s

  1. How does reflection differ from refraction and diffraction?
AReflection is the only process in which the wave does not continue moving forward.
BReflection is the only process that involves a change in the wave.
CReflection affects all types of mechanical waves, but refraction and diffraction do not.

Verified Answer :

karla899

1- CAST IRON

2- 50 mm/s

3-  Reflection is the only process in which the wave does not continue moving forward.

 

Answer : 1. cast iron

2. 50 mm/s

3. Reflection is the only process in which the wave does not continue moving forward.

Explanation :

1. The speed of sound is greatest in solid. So, the speed of the sound is fastest in cast iron. It is approximately equal to 4600 m/s.

2. Wavelength, λ = 10 mm

Frequency, υ = 5 Hz

Speed = wavelength × frequency

Speed = 10 mm × 5 s⁻¹

Speed, s = 50 mm/s

3. The bouncing back of light is called the reflection of light. In this process, the wave does not continue moving forward.