Explanation

The number of fissions taking place per second in a 300 MW reactor is approximately 9.38 x 10^18.

Explanation

• Light from the Sun takes about 8 minutes to reach Earth due to the short distance of approximately 93 million miles.
• Light from Sirius, which is much farther away at about 8.6 light-years, takes approximately 8 years to reach us.

Explanation

• Transverse waves are waves where the particles of the medium oscillate perpendicular to the direction of wave propagation, creating crests and troughs.
• Examples include light waves, radio waves, and water waves.

Explanation

• During nighttime, the air above the land loses heat and cools down, causing its density to increase.
• This is because cool air contracts and becomes denser than warm air.

Explanation

• Convection is the mode of heat transfer that occurs when a fluid (such as a gas or liquid) moves and carries heat energy from one location to another.
• This transfer of heat occurs due to the bulk motion of the fluid.

Explanation

The least distance of distinct vision for a normal human eye is 25 cm.

This means that when an object is placed at a distance of 25 cm or more from the eye, a clear and distinct image is formed on the retina. 

Explanation

Fringe spacing in a double-slit experiment increases when using light with a longer wavelength.

Therefore, red light will produce the largest fringe spacing compared to blue, green, or yellow light. 

Explanation

h = u²/2g = (16)² / (2 × 9.8) = 256 / 19.6 = 13.06 ≈ 13.1 m.

Explanation

• Meteoroids are small rocky, stony, and metallic debris that orbit the Sun in various orbits and speeds.
• When a meteoroid enters Earth's atmosphere, it becomes a meteor, also known as a shooting star or meteors or fireballs.
• If a meteor survives its passage through the atmosphere and lands on Earth, it is called a meteorite.

Explanation

• Neptune is the farthest planet.
• It was visited by the spacecraft Voyager 2.
• It's is a very windy place.
• It has six rings.
• It has 14 moons.