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However, the speed of light is not constant as it moves from medium tomedium. When light enters a densermedium (like from air to glass) the speed and WAVELENGTH of the lightwave DECREASE while the frequencystays the same. ... Light moves SLOWER through denser media because more PARTICLES get in its way.

Z-2 ,a-4

Atomic no DECREASE by 2 and MASS no DECREASES by 4

Whenever a pure SEMICONDUCTOR is doped with PENTAVALENT impurity ATOMS it will transform into n-type semiconductor.

The ANSWER Is ATTACHED :)

Heya mate, Here is UR answer

गति = 60 km/ घंटा

= 60×5/18 मीटर/ सेकंड

समय = 45 मिनट

दूरी = गति × समय








दूरी = 750 मीटर।




Speed = 60 km/hr

=60×5/18 m/sec

Time =45 MIN

DISTANCE= speed ×time

=60×5/18×45

= 13500/18

=750 m

==========================

WARM regards

@Laughterqueen

Be Brainly ✌✌✌

Your ANSWER is In IMAGE :)

Your ANSWER Is ATTACHED in The IMAGE..

You can GO Through It!

I will PREFER LAMP A

Cjwinfiutjjfjjskwiksosoosososososis

1.It is USED in MOBILE communications
2.It is used in DISTANCE measurement
3.It is used in CDMA COMMUNICATION

Your ANSWER Is ATTACHED :)

YUPS it is but not IMPOSSIBLE to COVER up

It should be positive because it has some mass=m ,height=h and WHENE a body goes upward then its G= -9.8 m/s^2 but whene an body come to GROUND its g= 9.8
(extra)but whene the drop is falling on ground the three force acting on it these are f=mg and TWO force against the gravity these are upthrust force and viscous force hope you understand

a BALLOON with LESS AIR

1. The UNIT should be reproducible.
2. It should not VARY with space and time.
3. It should not be AMBIGUOUS in nature.

It works on the PRINCIPLE of the force EXPERIENCED by a current carrying conductor when PLACED perpendicular to a magnrt(also KNOW as lorentz force/law)

Is the ANSWER 110÷101 m/s?

Yes.we can say
hope it HELPS you

This is because of twinkling as the light passes throught the different LAYERS of atmosphere.
so the light US refracted because of different layers have different air pressure.

and THATS why we seen often different COLOURS in different directions.when the STARS are twinkled.


thank uuu

A has more POWER because A TAKE 15S to CLIMB

Hey mate here is the answer -

The POTENTIAL difference between two ends of the conductor is directly proportional to the CURRENT passing through it at a CONSTANT temperature.

REFER to the attachment for the graph .

HOPE this helps you

Let US assume that your SCHOOL TIME is 9:00 AM.
let us assume you reaches school 10 min late, therefore you reaches at 9:10 AM
and let us think that your friend reaches 5 min earlier, therefore he reaches at 8:55 AM.
the DIFFERENCE in time is 10+5 = 15 min.
hope this helps you.

A new series of conjugated random terpolymers (PDPP2T-SE-Th) was synthesized from an electron-deficient diketopyrrolopyrrole (DPP)-based unit in conjugation with two electron-rich selenophene (Se) and thiophene (Th) species, with a VIEW to inducing different crystalline behaviors of the polymers. The crystallinity of the polymers can be SYSTEMATICALLY controlled by tuning the ratio between Se and Th; an increase in Se content induced a remarkable increase in the melting and crystallization temperatures as well as the crystallinity of the PDPP2T-Se-Th terpolymers. These changes in the crystalline PROPERTIES of polymers had a dramatic effect on the performances of organic field-effect transistors (OFETs) and polymer solar cells (PSCs). However, their effect on each type of devices was very different. The charge carrier mobilities of the PDPP2T-Se-Th terpolymers in OFET devices increased remarkably as the Se content increased in the polymers, showing that PDPP2T-Se100 with Se/Th ratio = 100/0 had very high hole and electron mobilities (4.72 and 5.54 cm2 V–1 s–1, respectively) with well-balanced ambipolar property.

For TRANSMISSION of SIGNALS UPTO LONG RANGE

Hello mate

The Harmonic Oscillator in One Dimension. The harmonic oscillator is the MODEL SYSTEM of model systems. ... Our model system is a single particle MOVING in the x dimension connected by a spring to a fixed point. Its potential energy is , where k is the spring constant.

Given :-

Speed of bullets = u m/s

As we know that bullets will move in Projectile.

Area covered = πr²

For MAXIMUM Area,

r = R(MAX) = u²/g (When Ø = 45° then R is max).

Maximum Area = πr²

M. A. = π (u²/g)²

M.A. = πu⁴/g²

Hence,

Maximum Area covered = πu⁴/g².

I THINK the ANSWER is 88 m
Not SURE ABT it
sorry

A. q+w is not STATE FUNCTION

That friction does not depend upon area of contact is a misnomer. Friction does not depend upon the apparent area of contact but depends very much on thereal area of contact. This can be explained easily -

When PRESSURE acts upon two surfaces in contact (maybe due to weight) and the surfaces have RELATIVE motion, the lateral friction force tends to shear the crests on the respective material surfaces. This is because of atomic roughness of the surfaces. When you touch a SURFACE, you are only touching the crests of the surface.

A macroscopic explanation is possible. The frictional shearing results inyielding of the material at the contact. Yielding is the phenomenon when a certain amount of load is applied after the elastic limit of the material, the material starts deforming continuously (flowing) under the applied stress, called plasticity. The friction force divided by the real area of contact equals roughly the yield stress, which is a material property and is a constant for a given material:

FfAreal=σy=constantFArσ=

or, Ff∝ArealF∝Ar

Now, the real area of contact is directly proportional the normal force:

Areal∝NAr∝

From the two equations, we get that Ff∝NF∝

Notice that the apparent area of contactappeared nowhere in the equations. Friction force depends only upon the real area of contact, not the apparent area of contact. Since it is very difficult for us to estimate the real area of contact, we often use the last equation in engineering and physics. It serves good most of the times.



.
.


.
.
.A is the answer

∆U=W is TRUE for which SYSTEM for....

A) adiabatic

Hope this HELPS.....

(a) In minute PORES of SPONGE air is trapped. When pressed, air is expelled out so it is COMPRESSIBLE. It is a solidas it has definite shape and volume. (b) Rubber band CHANGES shape under force and regain shape when force is removed.

A galvanic CELL is a type of electrochemical cell. It is used to supply electric current by making the transfer of electrons through a redox reaction.
A voltaic cell has a liquid ELECTROLYTE(DILUTE sulphuric acid)
A dry cell has a pasty electrolyte (mixture of ammonium chloride, coke and a LITTLE water and manganese DIOXIDE)so that it can be used at any angle.
(Voltaic cells are same as Galvanic cells)

Hey mate!!!

here is the answer.....

force = 45N
AREA = 2 cm SQ or 0.0002m sq

pressure = force/ area
= 45/0.0002
= 225000p

so pressure is 225000p

HOPE IT HELPS....

P=1/f=1/4 v=-40cm U=? 
1/f=1/v-1/u
1/4=1/-40-1/u
u=-3.2

In physics, a phonon is a collective excitationin a periodic, elastic arrangement of ATOMS or molecules in condensed matter, like solidsand some liquids. Often designated a quasiparticle,[1] it represents an excited statein the quantum mechanical quantization of the modes of vibrations of elastic structures of interacting particles.

Phonons PLAY a major role in many of the physical properties of condensed matter, like THERMAL conductivity and electrical conductivity. The study of phonons is an important part of condensed matter physics.

The concept of phonons was INTRODUCED in 1932 by Soviet physicist Igor Tamm. The name phonon comes from the Greek word φωνή (phonē), which translates to sound or VOICE because long-wavelength phonons give rise to sound. The name is based on the word photon.

Shorter-wavelength higher-frequency phonons are responsible for the majority of the thermal capacity of solids.

卄乇ㄚ 千尺丨乇几ⅅ

卄乇尺乇 丨丂 ㄚㄖ凵尺

卂几丂山乇尺


===================================


⊙ Mass = 4kg

⊙ h (s) = 20m

⊙ U = 0 m/sec

⊙ V = 16m /sec


Using the 3rd equation of MOTION......









so, a = 6.4 m/s^2.


Now ,





Now ,






so, WORKDONE is 512 joules.



Hope it helps you

B=R HOGA it's RIGHT anaswer

In the middle of enjoying a spectacularly colored sunrise or sunset like the one in the photo above, have you ever stopped to ask why it is that the sky turns such colors when the sun is low in the sky? It's all about the distance that light has to travel to get to our eyes, which is much farther when the sun is at the horizon than when it is directly overhead. Portage explains it well:

"During sunrise and sunset, when the sun lies low on the horizon, the rays of sunlight must pass through almost 30 percent more area of atmosphere than they do during the day, and a higher number of larger atmospheric particles (i.e., dust, or water vapor) before they reach US. The shorter violet and blue wavelengths scatter away from our field of vision. However, the longer wavelengths of light do not scatter as much and the sky becomes filled with yellow, orange and red. Red has the longest wavelength in the visible spectrum, so when the sun lies on the horizon, it appears red. During a rainstorm, the water vapor in the air acts like a prism, separating light by the various wavelengths. This is why we see rainbows. The angle is important to seeing the separate colors, which is why when we move the rainbow appears to move."

Stephen Corfidi, a National Oceanic and Atmospheric Administration (NOAA) meteorologist, makes an excellent point in a Q&A with National Geographic about the intensity of light and what makes a sunset or sunrise particularly "good":

"EVERYTHING is connected. And as humans, we like to think color is concrete: 'Oh, that's a blue sky,' or 'That's a brown table.' But the colors you see depend on the light's path before it got to you, how the object you are viewing REFLECTS that light, and what your eyes are sensitive to. Absolutes don't really exist in color perception. It's rather disquieting when really you start thinking about it!"

So, essentially, everyone experiences a sunset in their own unique way, DEPENDING on countless tiny factors. The science as well as the individual experience is something that can be discussed for hours on end.