16-C17-Waves A stationary railroad whistle is sounded. An echo is heard 8 second

Question

16-C17-Waves A stationary railroad whistle is sounded. An echo is heard 8 seconds (BD) 1372 m Name of sound is 343 m/s, how far away is the reflecting surface (AB) 686 m (BC) 5488 An echo is heard 8 sconds later by the train's engineer. If th 88 m (CD) 52.4m (AE) 2744 m Use the following figures to answer question 17. Consider the figures depicting rectangular pulses on a string. 5 edend, which one of the pattems above would represent the E (CD) 5 17. If pulse 1 were reflected from a which reflected pulse? (AB)1 (BO)2 (AC) 3 18. A guitar string produces 7 beats per second when sounded when sounded with a 890 Hz tuning fork. What is the vibrata 8o sounded with a 880 Hz tuning fork & 3 beats per second second Wis the vibrational frequency of the string? ningforkc,883 (AD) 880 Hz "(BE) 893Hz

Explanation / Answer

16)

speed of sound v = 343 m/s

time taken to hear echo t = 8 seconds

distance travelled by sound = 2d

v = 2d/t

d = (vt)/2 = (343*8)/2 = 1372 m <<<<===========ANSWER

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17)

the reflected pulse is inverted

the pulse pattern is as shown in pulse (3)

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18)

frequency of guitar = f

sounded with frequency f1 = 880 Hz

beat frequency = f - f1 of f1 - f

beat frequency

f - 880 = 7    or   880 - f = 7

f = 887 Hz       or   f = 873 Hz

sounded with frequency f2 = 890 Hz

beat frequency = f - f2       or   f2 - f

beat frequency = f - 890 = 3   or   890 - f = 3

       f = 893 Hz   or   f = 887 Hz

f is same

f = 887 Hz <<<<---------ANSWER

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