L 1.1.4 Quiz: Amplitude, Frequency, and Speed Question 8 of 10
Which of the following statements are
truel
O A. To find the period of a wave, multiply the frequency by 10.
B. The unit for frequency is the hertz.
C. The frequency of a wave is equal to 1 divided by the period of the
wave.
D. The symbol used for the period of a wave is p.
SUBMIT

air quality

poor drinking water

and heavy polution

can lead to poor health

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

it takes on an electronical energy