Explanation

Our solar system takes approximately 250 million years to complete one orbit around the Milky Way galaxy.

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

Comets are icy bodies that orbit the Sun, and they appear as a long hair-like strand due to their tail of gas and dust.

They consist of three main parts:

1. Nucleus: The central, solid part of the comet.
2. Coma: The cloud of gas and dust surrounding the nucleus.
3. Tail: The long, trailing cloud of gas and dust that follows the comet as it orbits the Sun.

Explanation

When an object is placed far away from a concave mirror, its image will be:

• Real (a projected image that can be seen on a screen)
• Inverted (upside down)
• Smaller in size than the object (reduced)

Explanation

• A car's steering system uses a wheel and axle.
• It is mechanism to transmit the rotational motion of the steering wheel to the wheels of the car, allowing the vehicle to turn.

Explanation

• Friction forces between the air and a moving object cause resistance.
• Which slows down the object and converts some of its kinetic energy into heat.

Explanation

An inclined plane is a slanting surface connecting a lower level to a higher level.

It is a simple machine that helps to lift or move loads to a higher position, and is commonly used in:

• Ramps
• Staircases
• Slides
• Ski lifts
• Hilly roads

Explanation

• Distance = 12 cm = 120 mm (since 1 cm = 10 mm)
• Time = 60 s
• Average speed = Distance / Time = 120 mm / 60 s = 2 mm/s = 2 mms¹
• So, the snail's average speed is indeed 2 mms¹.

Explanation

• Radio waves have a much higher frequency than sound waves.
• Sound waves have frequencies in the range of 20 Hz to 20,000 Hz, while radio waves have frequencies in the range of thousands to billions of Hz (kilohertz to gigahertz).
• Radio waves are a type of electromagnetic wave, and their frequency is typically measured in kilohertz (kHz), megahertz (MHz), or gigahertz (GHz).
• For example, FM radio broadcasts typically use frequencies between 88 MHz and 108 MHz, while AM radio broadcasts use frequencies between 535 kHz and 1605 kHz.

Explanation

AM (Amplitude Modulation) radio operates in the frequency range of 550 to 1700 KHz.