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3 years ago

9

Which of the following is not a potential sign of chemical change? a. release of gas c. change of color b. evaporation of water

d. production of gas Please select the best answer from the choices provided A B C D

1 answer:

vitfil [10]3 years ago

5 0

B is the answer. because it is a physical change

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3 years ago

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IRINA_888 [86]

Answer:

The frequency of sound heard by the boy is 1181 Hz.

Explanation:

Given that,

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Speed of sound = 343

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Using formula of frequency

$f = f_{0}(\dfrac{v+v_{0}}{v-v_{s}})$

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$v_{s}$ = speed of source

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Put the value into the formula

$f=1210\times\dfrac{343+(-8.25)}{343-0}$

here, source is at rest

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$f=1181\ Hz$

Hence, The frequency of sound heard by the boy is 1181 Hz.

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