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Yogita Ingle 6 years, 11 months ago
In the periodic table each period begins with the filling of principal quantum number (n). The value ofnfor the sixth period is 6. Forn= 6, azimuthal quantum number (l) can have values of 0, 1, 2, 3, 4. In the 6thperiod, electrons can be filled in only 6s, 4f, 5d,and 6psubshells. Now, 6shas one orbital, 4fhas seven orbitals, 5dhas five orbitals, and 6phas three orbitals. Therefore, there are a total of sixteen (1 + 7 + 5 + 3 = 16) orbitals available. According to Pauli’s exclusion principle, each orbital can accommodate a maximum of 2 electrons. Thus, 16 orbitals can accommodate a maximum of 32 electrons. Hence, the sixth period of the periodic table should have 32 elements.
Posted by Priya Gupta 6 years, 11 months ago
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Yogita Ingle 6 years, 11 months ago
Mass |
Weight |
| Mass can never be zero. | Weight can be zero. As in space if no gravity acts upon an object, its weight becomes zero. |
| Mass is a scalar quantity. It has magnitude. | Weight is a vector quantity. It has magnitude and is directed toward the center of the Earth or other gravity well. |
| Mass is commonly measured in kilograms and grams. | Weight is commonly measured in Newtons. |
| Mass doesn’t change according to location. | Weight varies according to location. |
| The mass may be measured using an ordinary balance. | Weight is measured using a spring balance. |
Ankul Bhadana 6 years, 11 months ago
Posted by Paramanand Mohanty 6 years, 11 months ago
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Yogita Ingle 6 years, 11 months ago
Muscles are the structures which in coordination with bones bring about movement in an organ. Muscle contraction is clearly explained by sliding-filament theory. Muscles are made up of 2 types of proteins namely Actin and Myosin filaments.
- Muscle starts to contract when it receives information from motor neurons.
- Neuromuscular junctions are formed by the junctions between motor neuron and sarcolemma of individual muscle fibre.
- As the neural signal reaches neuro-muscular junction, acetyl choline is released at this place.
- Acetyl choline causes an action potential in the sarcolemma and releases calcium ions in the sarcoplasm.
- Calcium ions bind to the troponin of the actin and bring a change in its structure. This causes a movement in tropomyosin.
- This structural change exposes myosin binding sites on actin filaments. Myosin binds to actin forming a cross bridge.
- These cross bridges pull the attached actin to the centre of the A band. Z-line is also pulled inwards. This causes shortening of sarcomere which is termed as muscle contraction.
- During contraction, I bands are reduced, A bands retain their length. Actin and myosin filaments slide over one another during contraction.
- Myosin releases ADP and pi and returns to its original state. New ATP binds to myosin head and the cross bridge is broken.
- Myosin head hydrolyses ATP to form a cross bridge.
- These events are repeated till calcium ions return into sarcoplasmic reticulum. Calcium ions are released till acetyl choline is present. Acetyl choline is released till the muscle fibre receives signal from motor neurons.
Posted by Himanshu Singh Chahuan 6 years, 11 months ago
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Yogita Ingle 6 years, 11 months ago
Returns to a factor refers to the change in output when an additional unit of variable input is employed.
The Law of Variable Proportion can be regarded to as 'Returns to a Factor'. According to this law, as more and more of variable factor (labour) is combined with the same quantity of fixed factor (capital), then the total product increases though gradually after a point, the total product becomes smaller and smaller.
The second stage of Law of Variable Proportion is referred as diminishing returns to a factor. Following are the reasons for diminishing returns.
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Type this question in youtube . You ll get the video of this question.
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Aman Kumar 6 years, 11 months ago
Ʌɐpɐʎ Ɐuɐɥsɹɐp . 6 years, 11 months ago
Nancy Rajput 6 years, 11 months ago
Ʌɐpɐʎ Ɐuɐɥsɹɐp . 6 years, 11 months ago
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Posted by Nancy Rajput 6 years, 11 months ago
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Gaurav Seth 6 years, 11 months ago
a) The number of ways in which at least two of them are in the wrong envelopes
</header>


=15+40+135+264+265
=719
b) The number of ways in which all letters be placed in the wrong envelopes
= 6! (
)
=720
=720(
)
=360-120+30-6+1
=265
Posted by Varsha Sharma 6 years, 11 months ago
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Yogita Ingle 6 years, 11 months ago
1Thank You