Explanation

The correct statement for a nuclear reactor is: "Moderator slow down the neutron."

Explanation

Increase in entropy generally means an increase in "randomness."

Explanation

The parameters that Kepler’s Law of period relates to are "the semi-major axis and the time period."

Explanation

Increasing the number of slits on a diffraction grating will increase the intensity of the central maximum of the diffraction pattern.

Explanation

• The energy received from the sun on earth is proportional to the square of the temperature of the sun (Stefan-Boltzmann law). If the temperature of the sun is doubled, the energy received on earth will increase by a factor of 2^2 = 4. 
• However, since the energy is also proportional to the square of the radius of the sun, and the radius remains constant, the total increase in energy received is 4^2 = 16.
• So, if the temperature of the sun is doubled, the rate of energy received on earth will be increased by a factor of 16.

Explanation

During projectile motion, the horizontal component of velocity "remains constant."

Explanation

The missing nuclide in gamma decay, where x turns into Ni-6528 + y, would be Ni6528.

Explanation

A vector field with a vanishing curl is called "irrotational."

Explanation

There is no point in arguing.

Explanation

• The rate of cooling of a body is typically faster at higher temperatures and slows down as the temperature difference between the body and its surroundings decreases. This behavior is governed by Newton's law of cooling.
• Given that the body cools from 90°C to 80°C in 5 minutes, we can infer that the rate of cooling will be slower when the temperature difference is smaller, such as when cooling from 70°C to 60°C.