Explanation

During charge, the positive electrode is an anode,

and the negative electrode is a cathode.

Explanation

Refraction is the change in the direction of light when it passes from one medium to another.

It is one of the most commonly observed natural phenomena of light.

Optical prisms and lenses involve refraction to redirect light, and so does the eyes of living beings.

Explanation

The highest percentage of fat in a fish is present in the brain.

Fish brains contain a high concentration of lipids.

They are essential for their neurological functions.

Explanation

In a constructive reaction, also known as a synthesis reaction, large molecules are formed from smaller ones.

This type of reaction involves the combination of two or more molecules to form a larger molecule, often with the release of energy.

Explanation

Question: A girl throws a small stone into a lake. Waves spread out from where the stone hits the water and travel to the bank of the lake. She notices that ten waves reach the side of the pond in a time of 5.0s. What is the frequency of the waves?

Answer: Frequency is defined as the number of waves (or cycles) per second. In this case, 10 waves reach the bank in 5 seconds, so:

Frequency = Number of waves / Time

= 10 waves / 5 s

= 2 waves/s

= 2.0 Hz

Explanation

Distance is a scalar quantity because it only has magnitude (amount of length) but no direction.

Distance is a measure of how far apart two points are, but it doesn't have a direction.

Explanation

Electric fields can be detected by electrons, which are charged particles that respond to the force exerted by the electric field.

Electrons will accelerate or decelerate in the presence of an electric field, allowing for the detection of the field.

Explanation

Resistivity is a property of the material itself, and is not a factor that affects the resistance of a specific conductor.

The resistance of a conductor depends on its length, cross-sectional area, and the material's resistivity.

Explanation

Aeroplanes fly in the troposphere, which is the lowest layer of the Earth's atmosphere, extending up to about 12 km (7.5 miles) above the Earth's surface.

The troposphere is where weather occurs, and it's the layer where aircraft operate, typically cruising at altitudes between 30,000 to 40,000 feet (9,100 to 12,200 meters).

Explanation

A food chain is a sequence of organisms that shows how food energy is transferred from one organism to another through consumption.

It typically starts with a producer (like a plant) and ends with a top predator, showing how energy is passed through repeated eating and being eaten.