Sound waves are traveling through air when they encounter a steel barrier. Some

Question

Sound waves are traveling through air when they encounter a steel barrier. Some of the sound waves are reflected and inverted, while the rest are transmitted through the tsteel barrier. The restoring forces within the steel are higher than that of air. Which of the following changes occur to the sound waves at the air/steel boundary? Select 2 answers and explain

a) their wavelength decreases in the air because the reflected waves are inverted b) their amplitude decreases in the stell because some of the waves are reflected c) their speed increases in the steel because the restoring forces are higher d) their frequency decreases in the air because the restoring forces are lower. Please explain

Explanation / Answer

c) their speed increases in the steel because the restoring forces are higher

Sound is a longitudinal wave requiring material medium for its propogation, closer the particles are easier it is for sound to move from one particle to another which increases its speed.

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