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7.8765 is the right answer

7.8765 is the right answer

7.876% is the right answer

7.876%is the correct answer

Spectrum, inoptics, the arrangement according to wavelength of visible, ultraviolet, and infraredlight. An instrument designed for visual observation of spectra is called aspectroscope;an instrument that photographs or maps spectra is aspectrograph. Spectra may be classified according to the nature of their origin,i.e.,emission or absorption. Anemission spectrumconsists of all the radiations emitted by atoms or molecules, whereas in anabsorption spectrum, portions of a continuous spectrum (light containing all wavelengths) are missing because they have been absorbed by the medium through which the light has passed; the missing wavelengths appear as dark lines or gaps.

We know that v=λf where v is velocity,λ is wavelength and f is frequency.

Range of spectrum is 400 nm to 750 nm which equals

400 nm=4×10⁻⁷ m750 nm=7.5*10⁻⁷m

Here v=c=3*10⁸ m/s

So, Upperlimit

v=λf∴3*10⁸=4*10⁻⁷*f∴f=3*10⁸/4*10⁻⁷∴f=0.75*10¹⁵So f=7.5*10¹⁴ Hz

Similarly The lower limit will be4*10¹⁴Hz

Thus the range of spectrum in frequency is 4*10¹⁴ Hz-7.5*10¹⁴ Hz

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Theenergy of nuclear fissionisreleasedas kineticenergyof thefissionproducts and fragments, and as electromagnetic radiation in the form of gamma rays; in anuclear reactor, the energyis converted to heat as the particles and gamma rays collide with the atoms that make up thereactorand its working fluid, ..

Ans :- Innuclear fission, an unstable atom splits into two or more smaller pieces that are more stable, and releases energy in theprocess.. option (2)

Entropy is an extensive property of a thermodynamic system. The second law of thermodynamics states that the entropy of an isolated system never decreases. Such systems spontaneously evolve towards thermodynamic equilibrium, the state with maximum entropy.

The lattice energy of a crystalline solid is a measure of the energy released when ions are combined to make a compound. It is a measure of the cohesive forces that bind ions. Lattice energy is relevant to many practical properties including solubility, hardness, and volatility

under numerical is there can u solve

Option Bas

a) Sugar : Sugar is a compound as it consists of two or more type of atoms such as Carbon, Hydrogen and Oxygen.

b) Sea water is a mixture as it consists of different compounds /ions present in sea but they are not bonded to each other.

c) Distilled water : Pure substance is a compound that consists of only Hydrogen and Oxygen which are covalently bonded to each other.

d) Carbon Dioxide : It is a covalent compound as it consists of Carbon

As pressure in each comparment is P atm . After the partition is removed The Total pressure will be P atm

The rate of reaction is K*[A]

here k = 4*10-³ and [A] = 0.02 = 2*10-² so, rate of reaction is 8*10^(-5)M/s

option A.

1. 6 significant figures.

2. scientific notation, 1.625 × 10^-3

1 mole of SO2= 64g

1g of SO2= -----mole?

= 1/64 mole

From the given data 1/64 moles sulphur dioxide contain x molecules

We know that equal moles of all gases will have equal number of molecules.

Hence 1/64 moles of Methane Contains x molecules of methane

Now we should find out the number of moles in 1g of methane

1 mole of methane = 16g

1g of methane = ------Mole?

= 1/16 mole

Since,1/64 mole of methane = x molecules

1/16 mole of methane contains = -------molecules?

= x * 64/16 = 4x molecules

The most common types of belt drives include:

Round belts

Round belts are are generally made of rubber. This type of belt is generally used for light loads, such as in a sewing machine or a vacuum cleaner.

V belts

V belts are arguably the most widely used belts in industry. V belts have a V shaped cross-section, which rests against the side of V pulley under tension. The V shaped cross-section prevents belt from slipping off.

Flat belts

Flat belts are also used to transmit power from one shaft to another. They are generally classified as either small woven endless belts or higher power flat belts. The woven endless belts are especially useful where minimum vibration is required at the driven pulley due to semi-elastic material used in construction. The higher power flat belts are often useful because they eliminate the need to high belt tension used to grip pulleys, which in turn reduces the load on the shaft bearings. The material used for high power flat belts is sticky yet abrasion-resistant rubber compounds.

Timing/toothed belts

Timing belts are toothed belts that use their teeth for power transmission, as opposed to friction. This configuration results in no slippage, and therefore, the driving and driven shafts remain synchronized. It’s more expensive to manufacture due to complexity of the belt and pulley shapes.

1. Least count is the smallest value that can be measured accurately by the given instrument

2. For the accurate measurement , the cylinder with minimum value of least count is preferable.

3. Answer : 1ml

The yellow gas is NO2. PbNO3 gives PbO+NO2+H2O

A. label all bottle s

A. label all bottles

Raoult's Law: Vapor Pressure andVolatile Solutes(in Ideal Solutions) ... In asolutionwith a nonvolatilesolute, only the pure vapor of the solvent is present above thesolution. 100% of the nonvolatilesolutestays insolution, none of it enters the vapor above thesolution.

Electric generator.

Anelectricgenerator is adevice which converts mechanical energy into electrical energy. we

Ageneratorconverts mechanical energy into electrical energy, while a motor converts electrical energy into mechanical energy. Both the devices work because ofelectromagneticinduction, which is when a voltage is induced by a changing magnetic field.

The modern-daygeneratorworks on theprincipleof electromagnetic induction discovered by Michael Faraday in 1831-32.Faraday discovered that the above flow ofelectriccharges could be induced by moving an electricalconductor, such as a wire that containselectriccharges, in a magnetic field.

A generator forces electrons to flow through an externalelectricalcircuit. It is somewhat analogous to a water pump, which creates a flow of water but does not create the water inside.

London dispersion forces (LDF, also known as dispersion forces, London forces, instantaneous dipole–induced dipole forces, or loosely van der Waals forces) are a type of force acting between atoms and molecules. They are part of the van der Waals forces. The LDF is named after the German-American physicist Fritz London.

The LDF is a weak intermolecular force arising from quantum-induced instantaneous polarization multipoles in molecules. They can therefore act between molecules without permanent multipole moments.

Number of molecules will be 3*6*10^23=18*10^23 molecules.

This question applies the concept of Avogadros law.

Avogadros constant is as follows :

1 mole of a substance = 6.022 × 10²³ molecules. How many moles are equivalent to 1.2 × 10²¹ molecules

We get this by :

(1.2 × 10²¹) / (6.022 × 10²³) = 0.001993 molesThe amount of moles in 392mg of H₂SO₄ is :

392 mg = 0.392 g

Molar mass of H₂SO₄ = 98g/mol

Moles = mass in grams /molar mass

= 0.392/98 = 0.004 moles

The amount of moles removed = 0.001993moles

Remaining moles = 0.004 - 0.001993 = 0.002007 moles

किसी भी विलयन का pH मान एक संख्या है जो विलयन की अम्लता और क्षारकता को दर्शाता है| किसी भी विलयन का pH मान संख्यात्मक रूप में द्रवीभूत हाइड्रोजन आयन (H+) के विलोम के लघुगणक के बराबर होता है। इसलिए किसी विलयन के pH को हाइड्रोजन आयन के ऋणात्मक लघुगणक के रूप में जाना जाता है। इस लेख में हम pH स्केल पर आधारित वस्तुनिष्ठ प्रश्न दे रहे हैं जिससे आपको विभिन्न परीक्षाओं की तैयारी करने में मदद मिलेगी, साथ ही pH स्केल की अवधारणा के संबंध में आपकी समझ और भी विकसित होगी|

N2O is the formula of laughing gas

An acid which can decolourise purple coloured potassium permanganate solution is: (a)sulphuric acid.

wrong answe

this is question of class 10 not class 8plz not answer again🤓🤓🤓🤓🤓

0.1 equivalent will weights to 4.9g.

Hence by adding 4.9g sulphuric acid to water and making the solution to 1000ml we get0.1 N solution of sulphuric acid.

Avogadro number is the name given to the 6.022× 1023 particles.It is the number of units in one mole of any substance.

how did u get 0.5 litres50ml =0.05 litrs

0.2 × 63 × 50/1000 = 0.63g

ok got it

i) Mole = Volume/22.4 (At S.T.P or N.T.P.)

So according to this formula 1 Mole of any gas occupies 22.4 litres at N.T.P.

For Nitrogen gas 1 mole = 14g

so, for given 1.4 g = 1/14 × 1.4 = 0.1 mole

Since 1 mole occupies 22.4 L at NTP

so, 0.1 mole will occupy 22.4×0.1 L at NTP

Hence 1.4 g of Nitrogen gas occupy 2.24 L at NTP.

but answer is1.12 L

no consept

i) 3-chloro-propanal

ii) 4-nitro-benzene-amine / p-nitro aniline.

One mole of CO2 contains

6.02 x 10^23 atoms of C12.04 x 10^23 atoms of O6.02 x 10^23 molecules of CO2

There are two 2NHgroup in semicarbazide. However,onlyone isinvolvedin theformationofsemicarbazone. This is because one N atom isinvolvedin resonance with carbonyl carbon atom and thus its lone pair is not available for bonding

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c) is the right option

potential energy is 2 times that of the total energy

and total energy on nth orbital is given by

E = -13.6*z²/n² eV => E = -13.6*1/(4)² = -0.85eV

but P.E = 2 T.E = -1.70 eV

so, option D