Physics Study Set 2

Give at least one example of each of the following: (a) longitudinal standing wave. (b) transverse standing wave.

A uniform rope hangs from a ceiling. Without tugging on the rope, you give the bottom of the rope a wiggle and a wave travels upward along the rope. What can you say about the speed of the wave as the wave travels up the rope?

Write an expression for a harmonic wave that has an amplitude of 18 cm, a wavelength of 2.0 m, and propagates to the left at 15 m/s.

What is the audible range of sound frequencies?

In western movies you often see a person putting his ear against the rails in the train tracks to find out if a train is approaching. Why would this give him advance knowledge of the approach of a train?

Sound waves in air are transverse waves.

A wave pulse on a string whose end is fixed is reflected without inversion.

Bats use infrasound to navigate.

Infrasound carries over long distances better than ultrasound.

FIGURE 14-1 -In Figure 14-1, the wavelength is

FIGURE 14-1 -In Figure 14-1, the frequency is

A wave pulse traveling to the right along a thin cord reaches a discontinuity where the rope becomes thicker and heavier. What is the orientation of the reflected and transmitted pulses?

Two strings are made of the same material. String 1 has radius r₁ while string 2 has radius r₂ = r₁/2. When stretched by the same tension, the respective speed of propagation of waves v₁ and v₂ satisfy the condition

Four waves are described by the following expressions, where distances are measured in meters and times in seconds. I y = 0.12 cos(3x - 21t) II y = 0.15 sin(6x + 42t) III y = 0.13 cos(6x + 21t) IV y = -0.23 sin(3x - 42t) Which of these waves travel in the +x direction?

Four waves are described by the following expressions, where distances are measured in meters and times in seconds. I y = 0.12 cos(3x - 21t) II y = 0.15 sin(6x + 42t) III y = 0.13 cos(6x + 21t) IV y = -0.23 sin(3x - 42t) Which of these waves have the same speed?

Four waves are described by the following expressions, where distances are measured in meters and times in seconds. I y = 0.12 cos(3x - 21t) II y = 0.15 sin(6x + 42t) III y = 0.13 cos(6x + 21t) IV y = -0.23 sin(3x - 42t) Which of these waves have the same period?

As the temperature of the air increases, what happens to the velocity of sound? (Assume that all other factors remain constant.)

The pitch of a sound is determined by

Seven seconds after a brilliant flash of lightning, thunder shakes the house. How far was the lightning strike from the house?

Sound vibrations with frequencies less than 20 Hz are called