Explanation

Solar cells convert sunlight directly into electricity using the photovoltaic effect.

They are widely used in renewable energy systems due to their efficiency and sustainability.

Explanation

The distance traveled by a free-falling object can be calculated using the equation:

s = (1/2)gt²

where s is the distance, g is the acceleration due to gravity (approximately 9.8 m/s²), and t is the time.

Given t = 5 seconds:

s = (1/2) × 9.8 × 5²

s = (1/2) × 9.8 × 25

s = 122.5 m

Explanation

Water has maximum density at 4°C.

When Water is in its Solid form (Ice) below 0°C.

Explanation

A meteorite is a small solid rock that survives its passage through the Earth's atmosphere and lands on the surface.

It differs from a meteoroid (before entering the atmosphere) and a meteor (which burns up in the atmosphere).

Explanation

Frequency is the number of cycles per unit time in a periodic wave.

It is measured in Hertz (Hz), where 1 Hz equals one cycle per second.