Explanation

The nucleus, which consists of protons and neutrons.

It is incredibly dense and occupies a very small volume compared to the extra-nuclear part (electrons).

However, the nucleus contains most of the atom's mass due to the significant mass of protons and neutrons.

Explanation

Evaporation occurs when molecules on a liquid's surface gain enough energy to escape into the air, and this can happen at any temperature, not just at boiling point.

It's a slow process at lower temperatures, but faster at higher temperatures.

Explanation

The potential energy (PE) of an object is calculated as:

PE = mass x gravity x height

= 1 kg x 10 m/s^2 x 1 m

= 10 Joule

So, the energy possessed by the body is 10 Joule.

Explanation

When water cools from 4°C to 0°C, ice crystals begin to form 

When water freezes, the water molecules form a lattice that increases the volume.

As a result, the density decreases

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ND22-1-2023

Explanation

Earth, Mars, and Pluto have atmospheres that contain Nitrogen gas.

• Earth: ~78% nitrogen
• Mars: ~2.6% nitrogen
• Pluto: thin atmosphere with nitrogen ice and gas

Neptune's atmosphere is mostly hydrogen, helium, and methane, not nitrogen.

Explanation

The property that does not depend on the nature of the solute molecule is the Colligative property. 

Colligative properties depend solely on the number of solute particles present in a solution, not their identity or chemical nature. 

Explanation

Explanation

Maximum height is reached when vertical velocity becomes zero.  

Using the kinematic equation:  

v² = u² - 2gh, with final v = 0,  

h = (vi² * sin²θ) / 2g.

Explanation

Refraction is the change in the direction of light when it passes from one medium to another.

It is one of the most commonly observed natural phenomena of light.

Optical prisms and lenses involve refraction to redirect light, and so does the eyes of living beings.

Explanation

Question: A girl throws a small stone into a lake. Waves spread out from where the stone hits the water and travel to the bank of the lake. She notices that ten waves reach the side of the pond in a time of 5.0s. What is the frequency of the waves?

Answer: Frequency is defined as the number of waves (or cycles) per second. In this case, 10 waves reach the bank in 5 seconds, so:

Frequency = Number of waves / Time

= 10 waves / 5 s

= 2 waves/s

= 2.0 Hz