You observe your friend rub a balloon on their wool sweater and then stick it to the wall. To investigate, you set up an experiment to test whether other objects will respond in the same way when you rub them against a sweater. What is the test variable in your experiment? The number of times you rubbed the object on the sweater
The observation that the object sticks to the wall
The sweater you use to rub against the objects
The type of objects you are testing in the experiment

The sweater you use to rub against the objects because you are using different sweaters.

a galvanic cell( aka voltaic cell) and electrolytic cell

explanation:

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it is to be noted that an alpha particle is an helium nucleus. so it contains 2 protons 2 neutrons and has a mass number of 4. when alpha decay particles are ejected from the nucleus it gets transformed into an atom which has atomic number less than 2 and a mass number less than 4.

an equation that could represent alpha decay is radium 226 decay of alpha particle forms radon 222.

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