Explanation

Stars are massive, luminous balls of gas that are primarily composed of:

• Hydrogen (about 70%)
• Helium (about 28%)

Explanation

• Resistance (C) is the opposition to the flow of electric current.
• It is measured in ohms (Ω).

Explanation

In most businesses and homes, electrical circuits are connected in parallel to ensure that:

• Each device receives the same voltage
• If one device fails or is turned off, others remain operational
• The entire circuit doesn't fail if one device is disconnected

Explanation

• When two bulbs are connected in a series circuit and one bulb blows, the entire circuit is interrupted, and the other bulb will also stop glowing, i.e., also blow (blast).
• This is because there is no longer a complete path for current to flow through the circuit.

Explanation

• A series circuit is a circuit that provides only one path for the current to flow.
• If one component is removed or fails, the entire circuit is interrupted.

Explanation

• The movement of free electrons is defined as electric current, which is the flow of electrons through a conductor, such as a wire.
• Electric charge refers to the property of matter, electric field is the force that surrounds charged particles, and electric potential is the potential energy per unit charge.

Explanation

• Dolphins have a wide audible range that is adapted to their aquatic environment.
• They can hear sounds in the range of 20 Hz to 120,000 Hz, which is far beyond the human audible range.

Explanation

• Cats have a unique audible range that is adapted to their hunting and communication needs.
• They can hear sounds in the range of 45 Hz to 64,000 Hz, which is wider than humans and dogs.

Explanation

Dogs can hear sounds in the range of 67 Hz to 45,000 Hz, which is slightly higher than the human audible range.

Explanation

• Whales have a unique audible range that is adapted to their underwater environment.
• They can hear sounds at very low frequencies, often below 20 Hz, and up to 31 kHz.