Explanation

A sound wave is a form of mechanical energy.

Sound energy is the energy released by an objects vibrations.

Explanation

• In space exploration, a spectroscope is typically used to analyze the light coming from stars, planets, and other celestial objects to determine their chemical composition.
• This helps scientists understand the formation and evolution of stars, planets, and galaxies.

Explanation

Fixing is the process in photography that removes residual silver halide from the image.

Without fixing, silver halide remains light-sensitive and can darken the image upon further exposure.

Explanation

Copper has higher conductivity, strength, and corrosion resistance, leading to fewer failures and repairs.

Its durability and long lifespan reduce replacement and maintenance costs over time.

Explanation

Ultrasound imaging uses high-frequency sound waves to create images of internal body structures.

These waves reflect off tissues and organs, and the echoes are used to form detailed images.

Explanation

Asteroids are actually larger than meteoroids, not smaller.

They are made of rock or metal and revolve around the Sun like planets.

Explanation

The Earth behaves like a huge bar magnet with a magnetic field similar to that of a dipole magnet.

Its magnetic poles are near the geographic poles, influencing compasses and navigation systems.

Explanation

Explanation

To find the final temperature, we can use the principle of heat transfer:

Heat lost by lead = Heat gained by water

Given:

Specific heat of lead (c Pb) = 0.030 cal/g°C

Mass of lead (m Pb) = 300 g

Initial temperature of lead (T Pb) = 100°C

Mass of water (m w) = 100 g

Initial temperature of water (T w) = 70°C

Specific heat of water (c w) = 1 cal/g°C (approximately)

Let the final temperature be T f.

Heat lost by lead = m Pb × c Pb × (T Pb - T f)

= 300 × 0.030 × (100 - T f)

Heat gained by water = m w × c w × (T f - T w)

= 100 × 1 × (T f - 70)

Equating the two expressions:

300 × 0.030 × (100 - T f) = 100 × 1 × (T f - 70)

Simplifying the equation:

9(100 - T f) = 100T f - 7000

900 - 9T f = 100T f - 7000

109T f = 7900

T f ≈ 72.5°C

Explanation