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  • 1 answers

Meghna Thapar 5 years, 2 months ago

A rare-earth element (REE) or rare-earth metal (REM), as defined by the International Union of Pure and Applied Chemistry, is one of a set of seventeen chemical elements in the periodic table, specifically the fifteen lanthanides, as well as scandium and yttrium. Scandium and yttrium are considered rare-earth elements because they tend to occur in the same ore deposits as the lanthanides and exhibit similar chemical properties, but have different electronic and magnetic properties. Rarely, a broader definition that includes actinides may be used, since the actinides share some mineralogical, chemical, and physical (especially electron shell configuration) characteristics.

The 17 rare-earth elements are cerium (Ce), dysprosium (Dy), erbium (Er), europium (Eu), gadolinium (Gd), holmium (Ho), lanthanum (La), lutetium (Lu), neodymium (Nd), praseodymium (Pr), promethium (Pm), samarium (Sm), scandium (Sc), terbium (Tb), thulium (Tm), ytterbium (Yb), and yttrium (Y). They are often found in minerals with thorium (Th), and less commonly uranium (U).

Despite their name, rare-earth elements are – with the exception of the radioactive promethium – relatively plentiful in Earth's crust, with cerium being the 25th most abundant element at 68 parts per million, more abundant than copper. However, because of their geochemical properties, rare-earth elements are typically dispersed and not often found concentrated in rare-earth minerals; as a result economically exploitable ore deposits are less common.

  • 1 answers

Tarun Mishra 5 years, 3 months ago

You can create your web page by HTML using the HTML codes in notepad
  • 2 answers

Shivam Kumar 5 years, 3 months ago

After 1848, nationalism in Europe moved away from its association with democracy and revolution. The liberal wave that was swaying Europe was certainly a challenge to the traditional institutions of monarchy and church. c.

Yogita Ingle 5 years, 3 months ago

After 1848, nationalism in Europe moved away from its association with democracy and revolution. The liberal wave that was swaying Europe was certainly a challenge to the traditional institutions of monarchy and church. c.

  • 3 answers

Honey Jain 5 years, 3 months ago

crow shooked the dust of snow on the poet from the hemlock tree. and the poet feeling change in happiness.

Yogita Ingle 5 years, 3 months ago

The crow was sitting on the branch of hemlock tree which was covered with dusts of snow. The movement of the crow led to the movement of the branch and the dust of snow fall on the poet which changed the mood of the poet.

Saikat Chakraborty 5 years, 3 months ago

The crow shooked the dust of snow on the poet from the hemlock tree.
  • 1 answers

Ashutosh Mishra 5 years, 3 months ago

ढढभश्ररभ
  • 1 answers

A S 5 years, 3 months ago

The risk was of flying the old Dakota aeroplane into the storm.The pilot took it as he wished to reach home as soon as possible and to be present at the breakfast table with his family in the morning.
IBM
  • 2 answers

Yashwant Yadav 5 years, 3 months ago

Kya

Varun Pawar 5 years, 3 months ago

Sweta
  • 5 answers

Liv 5 years, 3 months ago

Sin theta = Perpendicular/ Hypotenuse

Shubham Saxena ???? 5 years, 3 months ago

Perpendicular / hypotenuse = sin ∅ .

Priyanshi Jadeja 5 years, 3 months ago

Sin thetha=opposite side/ hypotenuse

Mfft Opp 5 years, 3 months ago

Sin theta= opposite side / hypotenuse

Yogita Ingle 5 years, 3 months ago

sin ∅ = opposite side/hypotenuse 

  • 1 answers

?Suhani Arora? 5 years, 3 months ago

Good evenimg
  • 1 answers

Yogita Ingle 5 years, 3 months ago

`Madam Rides the Bus’ is the story of an eight-year-old girl Valli. She was a wonderful girl. She was mature, clever, practical and self-respecting beyond her age. Standing in the front doorway and watching what was happening in the street was her favourite pastime. She was a great planner. She thriftily saved every penny that came her way for her first bus journey. During her first bus journey, Valli was full of enthusiasm and excitement. She enjoyed the landscape, the canal, palm trees, distant mountains and green fields stretching out as far as her eye could see. She reacted strongly when she was called ‘a child’ or ‘madam’. The self-respecting girl refused to accept a free cold drink offered by the bus conductor. She planned her bus journey during the nap hours of her mother. Interestingly, her mother could never know of the bus journey her daughter undertook during her nap in the afternoon.

  • 2 answers

Honey Jain 5 years, 3 months ago

The postmaster himself gave a part of his salary and also requested his employees and a few friends to contribute for charity. He felt happy and satisfied when Lencho received the money. This shows that he was a kind and empathetic person as well. He loved to help others.

Yogita Ingle 5 years, 3 months ago

The postmaster was a fat and amiable fellow. He was a sensible and a compassionate human being who was amazed by the depth of faith in God that is shown by Lencho. Although at first he was amused by Lencho’s letter to God, he became serious and wanted to help Lencho because he didn’t want his faith to be shaken.

The postmaster himself gave a part of his salary and also requested his employees and a few friends to contribute for charity. He felt happy and satisfied when Lencho received the money. This shows that he was a kind and empathetic person as well. He loved to help others.

  • 2 answers

Thejhasvi Dhanavel 5 years, 3 months ago

A convex lens can produce the complete image of the object even though half of the lens is covered. This is because light coming from the object can be refracted from the other half of the lens. However, the intensity of light will be reduced.

Yogita Ingle 5 years, 3 months ago

A convex lens can produce the complete image of the object even though half of the lens is covered. This is because light coming from the object can be refracted from the other half of the lens. However, the intensity of light will be reduced.

 

  • 4 answers

Satyam Lodhi Rajput 5 years, 3 months ago

Asexual reproduction for 1 is generation 2 is budding 3 is spore formation

Priyanshi Jadeja 5 years, 3 months ago

(i)Planaria-Regeneration (ii)Hydra-Budding (iii)Rhizopus-Spore Formation

Thejhasvi Dhanavel 5 years, 3 months ago

(i) Planaria - Regeneration (ii) Hydra - Budding (iii) Rhizopus-Spore Formation

Yogita Ingle 5 years, 3 months ago

(i) Planaria - Regeneration
(ii) Hydra - Budding

(iii) Rhizopus-Spore Formation

  • 1 answers

Yogita Ingle 5 years, 3 months ago

A group of organic compounds which can be represented by the same general formula with a same functional group and which show more or less similar trends in their properties is known as homologous series.
Example: The homologous series of straight chain alkanes can be represented by the general formula Cn​H2n+2

  • 2 answers

Yogita Ingle 5 years, 3 months ago

There should be equitable distribution of resources among all people—rich and poor, so that all are benefitted from the development of these resources. Such an even distribution of resources restricts the exploitation, wastage and misuse of these resources. The poor will also get a chance to make benefit for himself and the society will improve. Unfortunately, it has been deserved that mainly the rich and the powerful take the full advantage of these resources and the poor are devoid of its pleasure. Thus, rich and powerful people for their personal benefit work against the equitable distribution.

Sawan Goja 5 years, 3 months ago

Equitable distribution of resources will ensure benefits to all the sections of the society rich as well as poor. This is necessary for the growth and development of a country. Money force is the main factor which is working against an equitable distribution of resources as rich people and rich nations try to encroach upon the share of the poor people or poor nations.
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Meghna Thapar 5 years, 2 months ago

Exclusive distribution means that your audiobook will only be available on Audible’s channels, which currently include Audible, Amazon and iTunes. You are not permitted to distribute or sell your audiobook in any other format on any site or store outside of Amazon, Audible, and iTunes. Audiobooks published distributed exclusively earn a 40% royalty.

If you choose non-exclusive distribution, you are able to also sell and distribute your completed audiobook through other distributors, such as on CD or other physical formats wherever you choose. Non-exclusive projects may not be published as a Royalty Share project, and must be completed as a Pay-for-Production or uploaded directly to ACX. Audiobooks distributed non-exclusively through ACX earn a 25% royalty.

  • 2 answers

Yogita Ingle 5 years, 3 months ago

The Basics conditions are:
1. Giving equal powers to all groups.
2. Avoiding Majoritarianism in holding powers. 
3. Not allow social differences to overlap as they are dangerous.
4. Avoiding Communalism and making a practice of Secularism.
5. Improve economic growth of minority groups and supporting them.

Varsha Kumbar 5 years, 3 months ago

Xvyy u
  • 3 answers

Priyanshi Jadeja 5 years, 3 months ago

Problems will definitely there because maths is a subject where you will face difficulties ; if you will work on it with keen interest than gradually you will not face difficulty.As per my advice you should 1st solve all doubts of ncert with the optional ones than you should solve sums from practice books i.e. RD Sharma,Navneet etc.... than don't forget to solve last 5 years paper. You can also practice with Gala. I hope it will help you! ??

Kritika Pathak 5 years, 3 months ago

(Prothom Boss) RS Aggarwal is better than ncert because it gives all questions of ncert

Prothom Bose 5 years, 3 months ago

Maths is not a subject which can be mastered in a day or two.It requires lots of practise.If you realy want to score good in maths than firstly go through all questions in ncert also examples given book(excluding the optional one).Once you are done with ncert and have enough time than solve refresher.But most importantly dont forget to solve the previous years question paper and also go through the latest pattern of exam paper which will be provided by CBSE on ots sites.
  • 4 answers

Mukta Srivastava 5 years, 3 months ago

Yes

Satyam Lodhi Rajput 5 years, 3 months ago

Yes

Yogita Ingle 5 years, 3 months ago

Plane mirrors and convex mirrors only produce virtual images. 

Prothom Bose 5 years, 3 months ago

Convex mirrors always forms a virtual and erect image.
  • 1 answers

Priya Singh 5 years, 3 months ago

Roshni, parkash
  • 1 answers
Yes they both are same.
  • 2 answers

Gaurav Seth 5 years, 3 months ago

Mr Keesing was an old maths teacher at Anne’s school.He was very strict by Nature. He would not tolerate anyone talking in his class. Naturally, he remained quiet annoyed with Anne who was no doubt the Chatterbox.He would punish her by giving her extra homework. Anne would stuff her assigned homework with such funny contents that not only the class but even Mr Keesing felt greatly delighted. But Mr Keesing still failed to stop Anne's habit of chattering in the class. With the intention of making a mockery of Anne he gave her an essay to write on the topic: ‘Quack, Quack, Quack,’ Mrs Chatterbox. Anne wrote her essay in the form of a story in verse. It told the story of a mother duck and a father swan. The father bites his three ducklings to death because they quacked too much. The father in the poem is clearly Mr Keesing and the ducklings are the children of his class. Luckily Mr Keesing took the joke the right way. He enjoyed this poem and read it  to several classes. He stopped giving Anne any extra homework. He allowed her to talk in the class. He even started making jokes with the children. Thus we see how even Mr Keesing got infected by Anne's sense of humour.

The school where Anne went to receive her education had nine teachers out of which seven were men. Her Maths teacher, Mr. Keesing, was one of those seven. He was a very strict teacher. He didn’t like anyone talking in the class whereas, Anne talked too much. One day he assigned her an extra piece of home-work which was an essay on ‘A Chatterbox’. Anne understood what her teacher wanted from her. She finished her assignment and decided to stay quiet in the class. She wrote the essay with convincing arguments to prove the necessity of talking. Mr. Keesing liked her arguments that she was like her mother who was more talkative than her. Thus, it was her inherited trait. Mr. Keesing, being a hard task master wanted to ridicule Anne and so gave her two more assignments ‘Quack Quack Quack’ and ‘An Incorrigible Chatterbox’. Anne took the help of her friend to write about the topic in verse and emerged successful. Mr. Keesing took the joke in the right way and allowed Anne to talk in the class. He understood that he had been wrong in telling her not to talk and in giving her extra homework.
  • 2 answers
f = -15 cm v = -10 cm Lens formula: 1/v – 1/u =1/f 1/-10 – 1/u = 1/-15 1/u = - (1/10) + 1/15 1/u = -2/60 u = -30 cm
Given that, Focal length f=15cm Distance of the image v=−10cm We know that, f 1 ​ = v 1 ​ − u 1 ​ −15 1 ​ = −10 1 ​ − u 1 ​ − u 1 ​ = −15 1 ​ + 10 1 ​ − u 1 ​ = 30 1 ​ u=−30cm Hence, the object is placed 30 cm away from the concave lens

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