Choose the sound with the highest pitch. assume all sound is traveling at 500 m/s.

a) 400 m wavelength
b) 1000 hz
c) 2 m wavelength
d) 120 hz

pitch is directly proportional to frequency.so, 1000 Hz among frequency value.

Pitch is indirectly proportional to wavelength.so, 2 m wavelength among wavelength values. Now, it would only become 1/2 which is less than 1000 hz

OPTION B IS ANSWER

Explanation :

The frequency of a sound wave is defined as the number of vibration per second i.e.

T is the time period of the wave

The pitch of an instrument shows that the highness and the lowness of the sound wave. It depends on the frequency of the wave. The higher the frequency, the higher will be its pitch.

Hence, the correct option is (B) " 1000 Hz ".                                                                                                              

answer: he got 23

explanation:

the word that best describes martin luther king jr.'s tone in the video is dignified

martin luther king, jr. was a social activist and baptist minister who played a key role in the american civil rights movement from the mid-1950s until his assassination in 1968. the video shows his manner and attitude having or showing a composed or serious manner that is worthy of respect so dignified is the correct answer