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

The male gonads in rabbits, as in all mammals, are the testes (singular: testis).

The testes are responsible for producing sperm and testosterone.

Explanation

Bronchitis is a condition in which the air passages (bronchial tubes) that carry air to and from the lungs become inflamed.

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.

Explanation

Analogous structures are features that have a similar function but different origins and structures, and are not considered in classification.

Explanation

Nervous coordination involves the transmission of electrochemical signals.

It is also known as nerve impulses or action potentials, through the nervous system.

This allows for rapid communication and coordination between different parts of the body.

Explanation

• Friction is a force that opposes motion between two bodies in contact, and it arises due to the interaction between the surfaces in contact.
• The roughness of the surfaces, including microscopic imperfections and irregularities, leads to interlocking and resistance to motion.
• This resistance is what we experience as friction.