Explanation

As ice cream melts, it absorbs thermal energy from the surroundings, but its internal thermal energy decreases as it changes from solid to liquid.

This is a physical change.

Explanation

Frequency is calculated using the formula:

f = v / λ

where v = 8 m/s (speed), λ = 2.5 m (wavelength)

So, f = 8 / 2.5 = 3.2 Hz

Explanation

The SI unit of pressure is Pascal (represented as Pa) 

in SI base units, one kilogram per meter per second squared (N/m2 or kg m-1s-2)

Definition of Pressure: Pressure can be defined as the force acting per unit area.

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The SI unit of energy/work is the joule (J)

Explanation

According to Boyle's Law, at constant temperature, the volume of a gas is inversely proportional to its pressure.

So, doubling the pressure will halve the volume.

Explanation

Silicon (Si) is the element most commonly used to fabricate solar cells and transistors.

Silicon is a semiconductor material that is widely used in the production of electronic components, including:

• Solar cells (photovoltaic cells)
• Transistors
• Microprocessors
• Diodes