the reason you hear a loud sound when you knock on a wall and put your ear u against it is because when you knock on said wall vibrations are bouncing off of the wall there fore making that loud banging sound.

5 0

3 years ago

A fire engine is rapidly approaching you at a stop light. What happens to the frequency and pitch of the sound as the fire engin

ValentinkaMS [17]

Answer:

The frequency increases, and the pitch increases

Explanation:

Doppler's law of sound is applicable in such case when the observer or the sound source or both are moving relative to each other.

In such a case due to space-time constraint the waveform of the sound adjust themselves so as to obey the law of conservation of energy.

<u>The apparent frequency of the sound for the observer is given by:</u>

$f_o=(\frac{s+v_o}{s+v_s} )f$ ....................................(1)

where:

$f_o=$ observed frequency

$f=$ original source frequency

$s=$ speed of sound

$v_s=$ speed of source relative to the observer (taken negative when approaching towards the observer and vice-versa)

$v_o=$ speed of observer relative to the source (taken negative when moving away from the source and vice-versa)

<u>According to the given situation, eq. (1) becomes:</u>

$f_o=(\frac{s}{s-v_s} )f$

Since, $\frac{s}{s-v_s} >1$

Therefore

$f_o>f$

Pitch is very closely related to the frequency, it means that how fast is the amplitude of sound varying with time.

7 0

3 years ago

What is gravitational potential energy?

Kay [80]

Answer:

D). energy resulting from the attraction between two masses.

Explanation:

4 0

3 years ago