Answer:
When electromagnetic radiations enter earth surface , it passes through several layers of our atmosphere in meantime some raditions get reflected back and some reaches to us .
Answer:
The mass of the nucleus is almost the same as the atom because a majority of the mass of an atom is stored in the nucleus.
The volume of an atom is larger than the nucleus. The nucleus is a tiny, concentrated area inside of the atom. Atoms are mostly empty space inside.
Explanation:
Answer:
The answer is C)
Explanation:
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A Wedge is made by placing two inclined planes back to back.
A Screw is made by wrapping an inclined plane around a cylinder.
<u>Explanation:</u>
- A wedge is an uncomplicated machine that consists of two sloping planes, providing it a thin end and thick end.
- A wedge is used to separate or split apart objects.
- Force is employed to the thick end of the wedge, and in turn, applies force to the object along both of its sloping sides.
- A screw is a simplistic machine that consists of an inclined plane wrapped around a cylinder or cone.
- The absolute mechanical benefit of wedges and screws is invariably higher than 1.
Answer:
The strength of an acid or alkali depends on the degree of dissociation of the acid or alkali in water. The degree of dissociation measures the percentage of acid molecules that ionise when dissolved in water. He could use universal indicators or litmus paper for this.
Explanation:
(See answer for the explanation)
