Question Detail

PHY 104 Wave and sound Objective Question

Question

For the wave described by y(x,t) = (8cm) sin 2π(0.3x−0.5t), what is its angular frequency (ω)?
Options
A 0.3 rad/s
B 0.5 rad/s
C 1.0π rad/s
Correct Answer
D 0.6π rad/s
Correct Answer

Option C is the correct answer.

Detailed Explanation

The general form of a wave equation is y = A sin(kx - ωt). The provided equation is y(x,t) = (8cm) sin 2π(0.3x−0.5t). Expanding this, we get y(x,t) = (8cm) sin (2π * 0.3x - 2π * 0.5t), which simplifies to y(x,t) = (8cm) sin (0.6πx - 1.0πt). By comparing this to the standard form, we can identify ω = 1.0π rad/s. This aligns with the 'Example' section on page 3 where ω is associated with the t term.

Hint

Compare the given equation with the general form y = A sin(kx - ωt) and distribute the 2π. The angular frequency ω is the coefficient of t.

Question Info