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A tiny object AB to be magnified is placed in front of the objective lens just beyond its principal focus fo’. In this case, the objective lens O of the compound microscope forms a real, inverted and enlarged image A’B’ of the object.

Now A’B’ acts as an object for the eyepiece E, whose position is adjusted so that A’B’ lies between optical centre C2 and the focus fe’ of eyepiece. Now the eyepiece forms a final virtual, inverted and highly magnified image A”B”. this final image A”B” is seen by our eye hold close to eyepiece, after adjusting the final image A”B” at the least distance of distinct vision of 25 cm from the eye.

Money plant is a climber

Climber is a plant which grows by taking support of another plant or any vertical surface. It rolls on the support and takes mechanical support to grow vertically

Creeper on the other hand is a plant which extends horizontally on the ground and does not grow much vertically as its stem is weak.

The color of ferrous sulphate crystals is green.

 

Ferrous sulphate crystals contain water molecules (FeSO₄. 7H₂O). On heating, ferrous sulphate crystals lose water and anhydrous ferrous sulphate (FeSO₄) is formed. So their colour changes from light green to white.

 

On further heating, anhydrous ferrous sulphate decomposes to form ferric oxide (Fe₂O₃), sulphur dioxide (SO₂) and sulphur trioxide (SO₃). So, the gas emitted smells like burning sulphur. 

 

In this reaction, the single reactant FeSO₄ decomposes to form three different products. So, the reaction is a decomposition reaction.

 

Author engineerPosted on May 26, 2024May 26, 2024Categories Ask QuestionLeave a comment on [Explain] What is the color of ferrous sulphate crystals? How does this color change after heating? Name the products formed on strongly heating ferrous sulphate crystals. What type of chemical reaction occurs in this type of change.

India has a rich cultural heritage. It includes a large number of things such as art and architecture, literature, language, festivals, and dance and music. The dance forms that we get to see across the land are mainly of two types- classical and folk dance. Folk dances or tribal dances are the types of dance which are usually performed by common people on various occasions like the beginning of a new season, birth of a child, a wedding, harvests, etc to express joy. They form a part of an art form called folk art that is commonly practised by a particular community. 

The origin of different folk cultures cannot be derived comprehensively but the traditions have been preserved down the ages. Each form of folk dance comprises of unique styles and movements and represents the culture and tradition of the particular state. Very colourful jewellery and unique costumes are worn to perform these dances. 

States and their folk dances

Every state has its own folk dances- sometimes just one type, sometimes more than one. The folk dances of a particular state usually depict some special traditions of that particular state. The names of folk dances of various states of India are as follows:

Andhra Pradesh 

Kuchipudi, Vilasini, Natyam, Andhra Natyam, Bhamakalpam, Veeranatyam, Dappu, Tappeta Gullu.

Assam

Bihu, Bichhua, Natpuja, Maharas, Kaligopal, Bagurumba, Naga dance, Khel Gopal, Tabal Chongli, Canoe and Jhumura Hobjanai are the folk dances of various tribes of Assam. 

Bihar

Jata-Jatin, Bakho-Bakhain, Panwariya, Sama Chawa, Bidesia.

Gujarat

Garba, Dandiya Ras, Tippani Juriun, Bhavai.

Haryana

Jhumar, Phag, Daph, Dhamal, Loor, Gugga, Khor, and Gagor.

Himachal Pradesh

Jhora, Jhali, Chharhi, Dhaman, Chhapeli, Mahasu, Nati and Dangi.

Jammu and Kashmir

Rauf, Hikat, Mandjas, Kud Dandi Nach and Damali.

Karnataka

Yakshagan, Huttari, Suggi, Kuntha, Karga and Lambi.

Kerala

Ottam Thulal, Mohiniattam and Kaikottikali. 

Maharashtra

Lavni, Nakata, Koli, Lezim, Gafa and Dahikala Dasavtar or Bohada.  

Odisha

Savari, Ghumara, Painka, Munari and Chhau.

West Bengal

Kathi, Gambhira, Dhali, Jatra, Baul, Marasia, Mahal, Chhau, and Santhali, etc. 

Punjab

Bhangra, Giddha, Daff, Daman, Bhand, and Naqual.

Rajasthan

Ghumar, Chakri, Ganagor, Jhulan, Leela, Jhuma, Susini, Ghapal and Kalbeliya.

Tamil Nadu

Kumi, Kolattam and Kavadi.

Uttar Pradesh

Nautanki, Raslila, Kajri, Jhora, Chappeli and Jaita.

Uttarakhand

Garhwali, Kumayuni, Kajari, Jhora, Raslila and Chappeli.

Goa

Tarangamel, Koli, Dekhni, Fugdi, Shigmo, Ghode, Samayi nrutya, Ranmale, Gonph and Tonnya mell.

Madhya Pradesh

Jawara, Matki, Aada, Khada Nach, Phulpati, Grida Dance, Selalarki, Selebhadoni and Maanch.

Jharkhand

Alkap, Karma Munda, Agni, Jhumar, Hunta Dance, Sarhul, Barao, Jhitka, Ghora Naach and Domkach.

Arunachal Pradesh

Chalo, Buiya, Wancho, Pasi, Popir, Kongki, Ponung and Bardo Chham.

Manipur

Thanh Ta, Dol Cholam, Lai Haraoba, Pung Cholom, Khmaba Thaibi, Nupa Dance, Raslila, and Lhou Sha.

Meghalaya

Mynsiem, Ka Shad Suk, Nongkrem and Laho.

Mizoram

Khuallam, Cheraw Dance, Chailam, Sawlakin, Chawnglaizawn, Sarlamkai/Solakia and Tlaglam.

Nagaland

Bamboo dance, Rangma, Zeliang, Nsuirolians, Gethinglim, Temangnetin, Hetaleulee.

Tripura- Hojagiri 

Sikkim

Chu Faat Dance, Sikmari, Singhi Chaam or the snow Lion Dance, Tashi Yangku Dance, Khukuri Naach, Chutkey Naach and Maruni Dance.

Lakshadweep

Lava, Kolkali and Parichakali are the dance forms on the island. 

Apart from the above mentioned names, there are many more folk dances in all these states. They represent the vibrant cultures of various tribes living there. Our folk dances are not only famous in the country but also acclaimed internationally. 

The Characteristics of Sound Waves

We live in a world of myriad sounds. From the moment we wake up till we go off to sleep, we experience a cacophony of sound. Science reveals the mystery of this amazing energy to us. Yes, energy. A sound is actually a form of energy that travels as a wave away from its source. It is a mechanical wave that is created by the back and forth vibratory movement of the particles of the medium (air, water, etc) through which it travels. The sensation when reaches our ear, goes to our brain; our brain processes it and we can hear the sound. 

Types of Waves

There are two types of waves- Longitudinal waves and Transverse waves. A longitudinal wave is defined as the wave where the particles of the medium vibrate back and forth towards the same direction in which the wave is moving. This medium can be a solid, liquid, or gas. Sound waves move in the same pattern and hence, are regarded as longitudinal waves. These waves consist of ‘rarefactions’ and ‘compressions’ of a medium. 

Now, what are Rarefactions and Compressions?

The longitudinal motion of air particles (or particles of any medium) gives rise to some regions in the air where the particles are compressed together. These regions are called compressions. Another set of regions are alternatively yet simultaneously created where the air particles are spread apart. These regions are called rarefactions. The compressions and rarefactions are the regions of high and low are pressure respectively. 

Coming to the transverse waves, they can be described as the waves in which the particles of the medium move up and down along an axis that is at right angle to the direction the wave. It is important to remember that these forms of waves are not produced in gases but only in solids and liquids. 

Characteristics of Sound Waves

Like any wave, a sound wave too has many characteristics. The five characteristics of sound are amplitude, wavelength, period, frequency, and speed or velocity. To understand sound well, it is imperative for everyone to learn about these characteristics.

Amplitude

When a wave passes through a medium, there is a temporary displacement of the particles of the medium from their actual positions. The maximum displacement of these particles of the medium from their actual positions when a wave passes through them can be defined as the amplitude of the wave. In other words, it is used to describe the size of the wave.  It is measured in ‘meter’ in the S.I. unit. 

Wavelength

Wavelength is the minimum distance in which the sound wave repeats itself. It is the length of one complete wave. In a sound wave, the combined length of an adjacent rarefaction and compression is known as the wavelength. It is also important to remember that the distance between the centres of two successive rarefactions and two successive compressions is equivalent to its wavelength. The S.I. unit of wavelength is also metre. 

Period

The time that is required to produce one complete wave or cycle is known as the period of the wave. One full vibration of the vibrating body produces one complete wave. So, the time taken for completing one vibration can be referred to as the period. The Period is denoted by the letter T and the unit of measurement is second (S).

Frequency

The total number of the cycles or waves that are produced in one second can be referred to as the frequency of the wave. Alternatively, frequency can also be defined as the number of vibrations per second. For instance, if 20 vibrations are produced in one second then the frequency of the waves will be 10 Hertz and 10 cycles. The frequency of a wave is fixed and it does not change when it passes through different medium. The unit of frequency is Hertz or Hz. 

Velocity

The distance that is covered or travelled by a wave in one second is regarded as the velocity (speed having a direction vector) of the wave. The unit of measurement of velocity is meters per second. The velocity of a wave can be found by dividing the distance travelled with the time taken. It can also be found by multiplying the frequency of the wave with the wavelength. 

It is important to keep in mind that it applies to all forms of waves like transverse waves (for example water waves), electromagnetic waves (like light waves and radio waves), and most importantly, longitudinal waves like sound waves. 

The idea that sound travels as wave dates back to about 240 B.C. Greek philosopher Chrysippus, Roman architect and engineer Vetruvius, and Roman philosopher Boethius each theorized that the movement of sound might take place in the form of waves.