Question

Question 13 (5 points)

If a door within a wall is open, sound produced on one side of the wall will be able to reach a person anywhere on the other side of the wall due to
Question 13 options:


A)
reverberation.


B)
diffraction.


C)
focusing.


D)
diffusion.
Question 14 (5 points)

If an object 18 millimeters high is placed 12 millimeters from a spherical mirror, and the image is formed 4 millimeters in front of the mirror, what's the image's height?
Question 14 options:


A)
6 millimeters


B)
8 millimeters


C)
22 millimeters


D)
14 millimeters
Question 15 (5 points)

Sound waves cannot travel through a/an
Question 15 options:


A)
elastic material.


B)
vacuum.


C)
liquid.


D)
solid.
Question 16 (5 points)

The shortest wavelength within the visible spectrum is _______ light.
Question 16 options:


A)
violet


B)
orange


C)
blue


D)
red
Question 17 (5 points)

An appliance is in a room, repeatedly making the same sound all day. As the room heats up from 25°C to 35°C, what changes?
Question 17 options:


A)
The sound wave's frequency increases.


B)
The sound wave's velocity increases.


C)
The sound wave's velocity decreases.


D)
The sound wave's frequency decreases.
Question 18 (5 points)

Which of the following helps support the argument that light behaves like a particle?
Question 18 options:


A)
Sound, which travels in waves, can't travel through a vacuum.


B)
Diffraction is observed with light.


C)
Interference is observed with light.


D)
Unlike sound, light waves don't need a medium to self-propagate.
Question 19 (5 points)

A wave with a period of 0.008 seconds has a frequency of
Question 19 options:


A)
80 Hz.


B)
800 Hz.


C)
12.5 Hz.


D)
125 Hz.
Question 20 (5 points)

Which of the following scenarios describes a condition in which resonance can occur?
Question 20 options:


A)
Two tuning forks are struck simultaneously, one with a frequency of 659Hz and one with a frequency of 639 Hz, causing beats.


B)
An isolated tuning fork is struck with a mallet, causing it to vibrate strongly at 659 Hz.


C)
Two tuning forks that vibrate at the same frequency are near each other. One tuning fork is struck with a mallet so that it vibrates.


D)
A tuning fork is over a column of air that is 9/2 the wavelength of the wave produced by the tuning fork.

Answer 1

13) B — Diffraction (sound bends/spreads through an open doorway/around obstacles).
14) A — 6 mm (m = −di/do = −4/12 = −1/3, hi = m·18 mm = −6 mm; magnitude 6 mm).
15) B — Vacuum (sound requires a material medium).
16) A — Violet (shortest visible wavelength).
17) B — The sound wave's velocity increases (speed of sound rises with temperature; frequency of source stays the same).
18) D — Unlike sound, light doesn't require a medium to propagate (the other choices are wave phenomena; D is the only one pointing to a non-mechanical/particle-like aspect).
19) D — 125 Hz (f = 1/T = 1/0.008 = 125 Hz).
20) C — Two identical-frequency tuning forks near each other, one driven, will produce resonance in the other.