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The number of electron present in outermost of an atom represent valency

Option (3) is correct.

i am getting ans as 45 m is it correct

No! your calculation of initial velocity is wrong, you cannot use speed - distance formula in the case of acceleration.

can you give the reason for that

distance covered in 1st 10sec => x= 1/2*(a)*(10)² = 50a

speed after 10sec => v = 10a so, y = 10a*(20) +1/2*(a)*(20)² =200a+200a = 400a

so, here y/x = 400a/50a = 8

y = 8x

option c

At the highest point, vertical velocity is zero. Hence dy/dt = 0, I.e, 16–30*t = 0. That means, the projectile reaches its maximum height at t = 8/15 seconds. At this time, y = 64/15 SI units.

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According to first law of thermodynamics,

ΔU = q + W

In adiabatic process, q = 0

Hence , ΔU = W

and

ΔU = Cv ΔT

Thus it can be written as

W = Cv ΔT

W = Cv [T2 - T1]

Adiabatic change: The change in pressure and volume of a gas resulting a change in temperature without exchange of heat in an isolated system is called adiabatic changes.

Adiabatic heating

Adiabatic processes are those in which there is no net heat transfer between a system and its surrounding environment (e.g., the product of pressure and volume remains constant). Because it is a gas, air undergoes adiabatic heating and cooling as it experiencesatmospheric pressurechanges associated with changing altitudes. Increasing pressure adiabatically heats air masses, falling pressures allow air to expand and cool.With adiabatic heating, as a mass of air descends in the atmosphere—as it does when it moves downslope from a mountain range—the air encounters increasing atmospheric pressure. Compression of the air mass is accompanied by an increase in temperature.

The experiment that shows the wave nature of electron is Davisson and Germer experiment.

9600A

You can understand that the central fringe itself is white. Fringe width of individual colours is directly proportional to (approximately) the wavelength of the colour. To understand why, it's easy enough. Central fringe is the place on the screen where there is zero optical path difference(or phase difference) between any to waves simultaneously emanating from the two slits. Moving away from the central fringe means there is a difference in distance travelled by such waves to reach the given point. When you move more closer to one of them means you increase the path difference. When you want more change in phase difference for lesser path difference, then wavelength must be smaller. 2 pi times the ratio of path difference to wavelength gives phase difference.

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SI UNIT IS :VOLTand it is denoted by letter v

hi

Intensity is directly proportional to the square of amplitude 'a'.As both slits have same intensity both have the same amplitude. Constructive interference is due to mixing of waves in phase and hence maxima.As in phase then amplitudes have to be added. So a+a = 2aSquare of this gives the intensity of maximum. So 4 a2​Hence 4 times the intensity of light being used

fringe width=wavelength xdistance from screen/slit differencehencefringe width=6000*10^-10*1/0.05*10^-2=0.12cmdistance between first dark and bright fringe is=0.12/2=0.06cmas fringe width is the distance in bright to bright hence half of distance

by finding its net force

by finding is net force

by finding the velocity of both objects

If the speed of an object is faster than the other object then we can say that an object is moving faster than another

4.5

If the speed of an object is faster than the other object then we can say that an object is moving faster than another

Snth= u + a(n-1/2)

= u -a/2 + an

Snt= 4 + 6n (given)

comparing both equations

u-a/2 = 4 , a = 6m/s^2

u = 4+a/2 = 7m/s

1.Its SI unit is theradianpersecondper tesla (rad⋅s−1⋅T−1) or, equivalently, the coulomb per kilogram (C⋅kg−1). The term "gyromagnetic ratio" is often used as a synonym for a different but closely related quantity, theg-factor. Theg-factor, unlike the gyromagnetic ratio, is dimensionless.

2.In SI units, B is measured inteslas(symbol: T) and correspondingly ΦB(magnetic flux) is measured inwebers(symbol: Wb) so that a flux density of 1 Wb/m2is 1tesla.

(b)

White light consists of waves of inumerable wavelengths starting from violet to red colour. Therefore if monochromatic light in Young’s interference experiment is replaced by white light, then the waves of each wavelength form their separate interference patterns. The resultant effect of all these patterns is obtained on the screen.

The path difference between waves starting from S1 and S2

at the location (M) of central fringe is zero,i.e., for pointMof screenS1m− S2m=0

i.e., the waves of all colours reach at mid pointMin same phase. Therefore the central fringe (atM) iswhite. As fringe width ,i.e., wavelength increases in order of colours denoted by VIBGYOR therefore on either side of it some coloured fringes are obtained in order of colour VIBGYOR. That is the violet (V) fringe appears first and the red (R) the last. After this the fringes of many colours overlap at each point of the screen and so the screen appears uniformly illuminated.

Thus if we use white light in place of monochromatic light the central fringe is white, containing on either side a few coloured fringes (in order VIBGYOR) and the remaining screen appears uniformly illuminated.

The tension will be related to the weight of the block A. All parts of the string will have the same speed and magnitude of acceleration.

As we look at the acceleration of the block Awrt wedge B, we can add a pseudo force on the block in the leftside direction. OR, equivalently, add an acceleration of "-a" towards left.With respect to the wedgeIf it happens that if Wedge moves by distance x, the block also moves x horizontally, then their relative acceleration is 0.

option(d) is correct

can u please provide me with the solution

Can u you find it wrt ground also

Resolving Power of Microscope:

For microscopes, the resolving power is the inverse of the distance between two objects that can be just resolved. This is given by the famous Abbe’s criterion given by Ernst Abbe in 1873 as

△d=λ/2nsinθ

Resolving power =1/△d=2nsinθ/λ

Wherenis the refractive index of the medium separating object and aperture. Note that to achieve high resolutionn sin θmust be large. This is known as the Numerical aperture.

Thus, for good resolution:

sin θmust be large.To achieve this, the objective lens is kept as close to the specimen as possible.

A higher refractive index (n) medium must be used.Oil immersion microscopes use oil to increase the refractive index. Typically for use in biology studies this is limited to 1.6 to match the refractive index of glass slides used. (This limits reflection from slides). Thus the numerical aperture is limited to just 1.4-1.6. Thus, optical microscopes (if you do the math) can only image to about 0.1 micron. This means that usually organelles, viruses and proteins cannot be imaged.

Decreasing the wavelength by using X-rays and gamma rays.While these techniques are used to study inorganic crystals, biological samples are usually damaged byx-raysand hence are not used.

The limit set by Abbe’s criterion for optical microscopy cannot be avoided. However, using different fluorescence microscopy techniques the Abbe’s limit can be circumvented. Stefan Hell used a technique called Simulated Emission Depletion (STED) and the duo Eric Betzig and W.E. Moerner used super imposed images using green fluorescent proteins to bypass the resolution limit and obtain optical images in never before seen resolution. All three were awarded the 2014 Nobel Prize in Chemistry for their pioneering work.

The actual resolving power of the human eye with 20/20 vision is typically considered to be about one arc minute or 60 arc seconds

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The resolving power of a telescope, can be increased by(i)increasing the diameter of its objective(ii)using light of short wavelength.

Alight wave that is vibrating in more than one plane is referred to as unpolarized light.Polarized light waves are light waves in which the vibrations occur in a single plane. The process of transforming unpolarized light into polarized light is known as polarization of light.

Brewster Law states that the tangent of the polarizing angle of incidence (i.e, the Brewster angle) of a transparent medium is equal to the refractive index of the medium.

i.e.,μ = tan ip

where ip = polarizing angle of incidence (p is in subscript) = Brewster angleand, μ = refractive index of the transparent medium

Brewster's Law: According to this law when unpolarised light is incident at polarising angle (i) on an interface separating a rarer medium from a denser medium, of refractive index μ such that μ = tan i, then light reflected in the rarer medium is completely polarised. Reflected and refractive rays are perpendicular to each otherPlease like the solution 👍 ✔️

Ans :- A metal is a material that, when freshly prepared, polished, or fractured, shows a lustrous appearance, and conducts electricity and heat relatively well. Metals are typically malleable or ductile. A metal may be a chemical element such as iron, or an alloy such as stainless steel.

Examples of metals arealuminium,copper,iron,tin,gold,lead,silver,titanium, uranium, andzinc.

Thefrictional chargingprocess results in a transfer of electrons between thetwoobjects that are rubbed together. Rubber has a much greater attraction for electrons than animal fur.Having an excess of electrons, the rubber balloon ischargednegatively.

Given Conditions⇒

Initial linear velocity(u) = 54 km/hr.= 54× 5/18 [Changing into m/s.]= 15 m/s.Radius of the wheel(r) = 0.35 m.

Now, Using the Formula,

Initial Angular Velocity (ω₁) = u/rω₁ = 15/0.35ω₁ = 42.86 radian/sec.

Also, Final Angular Velocity (ω₂) = 0

Now, Using the Formula,Angular Acceleration (α) = (ω₂ -ω₁)/t= (0 - 42.86)/15= - 2.86 radian/sec²

Moment of Inertia about the axis of the rotation(I) = 3 kg-m²

∴ Torque = I×α⇒ Torque = 3× -2.86⇒ Torque = -8.58 Nm.

Hence, the average negative torque is -8.58 N-m.

thankyou radius is o.45 not 0.35 but no problem I understand concept

A large wave on the ocean, usually caused by an undersea earthquake, a volcanic eruption, or coastal landslide. A tsunami can travel hundreds of miles over the open sea and cause extensive damage when it encounters land. Also called tidal waves

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