1) A chemical change is used by scientists to create new substances, and a physical change happens naturally. A chemical change results in a new substance being formed; whereas, a physical change will result in a different state of matter.

6 0

3 years ago

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If the current through a bulb in a series circuit is 0.4 A and the potential difference across the bulb is 3 V then what is the

sergey [27]

Resistance of the bulb is 7.5 ohms

Explanation:

In a circuit, according to Ohm's Law, the potential difference (voltage) across an element is directly proportional to the current flowing through it.

That is, V ∝ I

⇒ V = IR, where R is the constant of proportionality called the resistance.

Here, current, I = 0.4 A and potential difference, V = 3 V

Resistance, R = V/I = 3/0.4 = 7.5 ohms

8 0

3 years ago

When a tuning fork vibrates over an open pipe and the air in the pipe starts to vibrate, the vibrations in the tube are caused b

Likurg_2 [28]

This is caused by A. resonance.
hope this helps!

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4 years ago

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