The threshold frequency for metallic potassium is 5.46×10¹⁴ calculate the maximum kinetic energy and velocity that the emitted electron has the wavelength of light shining on the potassium surface is 350nm (me=9.11×10³¹)

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

air

in a tire you fill a tire with air

then a couple days later you check the air pressure in the tire

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