Why would a passing car exhibit a greater sound frequency change when it moves at $30$ m/s than when it moves at $12$ m/s?

An ambulance siren blares continuously as the ambulance approaches you and then moves away. How does the sound from the siren changes and why?

The speed of sound $v$ in air varies with temperature. It can be calculated in $\mathrm{ft} / \mathrm{sec}$ using the equation $v=1087 \sqrt{\dfrac{T+273}{273}}$, where $T$ is temperature (in ${ }^{\circ} \mathrm{C}$).

(a) Approximate $v$ when $T=20^{\circ} \mathrm{C}$. (b) Determine the temperature to the nearest degree, both algebraically and graphically, when the speed of sound is $1000 \mathrm{~ft}/\mathrm{sec}$.

How does the speed of sound in a gas change when you raise the temperature from $0^{\circ} \mathrm{C}$ to $20^{\circ} \mathrm{C} ?$ Explain briefly.

Write the letter of the best SYNONYM (the word or phrase most nearly the same in meaning as the word in bold-faced type).

____ adjusted the thermostat

a. sound

b. light

c. temperature

d. speed

Choose the letter of the best answer: olfactory : redolent : : ____________________.

a. taste : vociferous

b. touch : ticklish

c. sound : evocative

d. sight : presentiment

e. touch : ad hoc

Write an exponential model to represent the situation. Tell what each variable represents.

A new sound system, valued at 800 dollars, decreases in value by 10 percent each year.

Label each underlined word as adverb or adjective. As he $\underline{\text{lazily}}$ dozed, an $\underline{\text{abrupt}}$ sound startled him.

Explain how sound travels from your vocal cords to your friend’s ears when you talk.

If the air temperature increases so that the speed of sound is now $350 \mathrm{~m} / \mathrm{s}$, by how much does the frequency change?

The speed of sound is measured to be $342 \dfrac{\text{m}}{\text{s}}$ on a certain day. What is this in $\dfrac{\text{km}}{\text{h}}$?

The shun sound in a suffix is usually formed by the letters sion or tion, as in percussion or automation. Add the suffix -sion or-tion to alter the verb extend into a noun.

Verify the for the wavelengths (in air) of the lowest and highest frequencies of sound that people can hear (20 and $20,000 \mathrm{~Hz}$, respectively).

Except when forming plurals, use ss to spell the s sound at the end of a word, as in redress. Complete the spelling of the word confe__.