Question

12 multiple choice 2 points which type of wave requires a material medium through which to travel? sound radio television x ray 13 multiple choice 2 points base your answer(s) to the following question(s) on the diagram, which represents waves a, b, c, and d traveling in the same medium. which wave has the longest period? a b c d

Explanation:

• Question 12: Sound waves are mechanical waves and require a material medium (like air, water, or solids) to travel. Radio waves, television signals (which use radio - like waves), and X - rays are electromagnetic waves. Electromagnetic waves can travel through a vacuum (no material medium).
• Question 13: The period of a wave is the time taken for one complete cycle. On a wave diagram, the wave with the longest wavelength (distance between two consecutive crests or troughs) in the same medium (where wave speed \(v = f\lambda=\frac{\lambda}{T}\), and \(v\) is constant for the same medium) has the longest period. Wave \(B\) has the longest wavelength among \(A\), \(B\), \(C\), and \(D\). Using the formula \(T=\frac{\lambda}{v}\) (where \(v\) is constant as the waves are in the same medium), a longer \(\lambda\) implies a longer \(T\).

Answer:

1. sound
2. B