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Natural gasisfoundin deep underground rock formations or associated with other hydrocarbon reservoirs in coal beds and as methane clathrates

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Frequency=1/Time Periodsi unit is hertz

Let the age of ram be X and age of Raju be y.

X+y=31......so X=31-y-------->1

3yrs back

X-3=4(y-3)

X-3=4y-12

X-4y=-9

Now substitute eqn 1 in this eqn

(31-y)-4y=-9

31-5y=-9

-5y=-9-31

5y=40

Y=8

So substitute y=8 in X=31-y

X= 31-8

X=23.

So ram is 23 and Raju is 8

Thank You So Much

First, we write all the known quantitiesa= -10m's^2s= 390 mu= +10m/ss=ut + 1/2at^2s=10t + 5t^2-390=10t + 5t^2-78= 2t - t^2t^2 - 2t - 78 = 0d= b^2 - 4acd= 4 + 312d= 316-b±√d/2a2±2√79/2=1±79.

therefore time taken to hit the ground will be 1+√79(In the answer 1 is being added, because it is the time taken to reverse the direction of velocity from upwards to downwards. Aa initially the object is moving upwards and then it starts to fall downwards.

option A must be an answer

Option (B) is correct.

1300m

O. 83m/s

Using formula

v = u + at

v = final speedu = initial speeda = accelerationt = time taken

50*5/18 = 20*5/18 + a*10a*10= 5/18(50 - 20)a = 5/18 * (30)/10a = 5/6 = 0.83 m/s^2

(D) is correct option

still more is required

if I draw this graph ,I will get only 1\2mark out of 3 mark

equation for photoelectric effect from which you can get almost all informations about photoelectric effect.

eVo=(1/2)mv( max)^2=h(f-fo)=hf-W=hc[1/(Lambda)-1/(Lambda,o)]. Here,

e is electronic charge.

m is mass of electron.

v(max) is maximum speed of photo electrons.

h is Planck's constant.

f is frequency of the incident radiation.

fo is threshold frequency( minimum frequency at which photoelectric effect starts.)

W(=hfo) is work function of photo sensitive surface.( The minimum energy to be spent by electron before emission.)

c is velocity of light.

Lambda is wave length of incident radiation.

Lambda,o is wave length corresponding to threshold frequency.

From the above equation, it can be seen immediately that when frequency of incident radiation is f, the maximum kinetic energy is

(1/2)mv(max)^2=K1=hf-W………..(1).

When frequency is doubled,

K2=2hf-W……………….(2).

Change in kinetic energy,

K2-K1=hf……………….(3)

The number of photo electrons determines photo electric current.

The number of photo electrons depends on the intensity of incident radiation and NOT on the frequency of incident radiation.

Hence, change in frequency will not change the photoelectric current.

We know that incident photons with energy hf are absorbed by the electrons of the photosensitive surface. So, electrons get this much energy in the form of kinetic energy,but they are not emitted with the same kinetic energy. This is because electrons are bound in the surface by a kind of potential well. So, before electrons are emitted they have to spend energy to come out from potential well. The minimum amount of energy that electrons have to spend is called work function (W) of the metal. Then, account of energies is

hf(gain by electron)-W( spent by electron)=(1/2)mv( max)^2 (maximum kinetic energy of emitted electron ).

Note that in the general formula nowhere number of electrons appear.

According to photon aspect of light, more the number of photons, more the intensity of light. If the frequency of incident is less than the threshold frequency then with any number of photons( with any intensity) the photo electrons will not be emitted. Also, intensity of light has nothing to do with the frequency of light. The photoelectric effect can be obtained with low enough intensity of light, but, having frequency sufficiently large.

this is not the answer related to the question

this is CBSE 2017-2018 sample question paper question,question no. is 19

option 1 is the right answer

v2b/Rg is the right answer

1 is appropriate for the question

1

option 1 is the correct answer

0 will be the answerfor currentcurrent flowing through3ohm resistance will be(25-15/6)+(25-30/3)

=0

to this qonton derived

Banking of rad means providing slopes to the road such that the outer edge is raised. This is necessary because:1) the force of friction providing the centripetal force is not reliable2) it prevents skidding3) the speed can be increased without skidding4) wear and tear of the tyres can be reduced

Let a vehicle of mass 'm ' is moving in circular road of radius r and angle of banking is ∅ as shown in figure.

see figure, upward force is balanced by downward force.so, Ncos∅ = mg .....(1)

leftward force is balanced by rightward force .so, Nsin∅ = mv²/r ......(2)

dividing equations (2) by (1), tan∅ = v²/rg∅ = tan^-1 (v²/rg)

here you can see that, angle of banking is independent of mass of vehicle.

when two velocities are in opposite direction so we add them

The half adder adds two one-bit binary numbers (AB). Theoutputis thesumof the two bits (S) and the carry (C).

Length of the pool: 90mAverage speed:Speed= Distance/Timespeed=180/60speed=30 m/s

Velocity:velocity=displacement/time

displacement=0( Since she comes back to the same place)

velocity=0

the average speed of usha is 3m s and her average velocity's s

Length of the pool: 90mAverage speed:Speed= Distance/Timespeed=180/60speed=30 m/s

Velocity:velocity=displacement/time

displacement=0( Since she comes back to the same place)

velocity=0

Length of the pool: 90mAverage speed:Speed= Distance/Timespeed=180/60speed=30 m/s

Velocity:velocity=displacement/time

displacement=0( Since she comes back to the same place)

velocity=0

The relation is :1/v - 1/u = 1/fFocal lens of a convex lens is positive as its focus is behind the lens whereas the focus of concave lens is in front of the lens so its focal length is negative.

Length of the pool: 90mAverage speed:Speed= Distance/Timespeed=180/60speed=30 m/s

Velocity:velocity=displacement/time

displacement=0( Since she comes back to the same place)

velocity=0

when ligt ray which comes from infinity after reflecting it converge in focus and then large amount of heat occur and it burns the paper but the paper should be kept in focus,

thank you

1. Concave2. Screens3. Real principal4. 3*10^8 m/sec.5. Converging Mirror

Diffraction refers to various phenomena that occur when a wave encounters an obstacle or a slit. It is defined as the bending of waves around the corners of an obstacle or aperture into the region of geometrical shadow of the obstacle. In classical physics, the diffraction phenomenon is described as the interference of waves according to the Huygens–Fresnel principle that treats each point in the wave-front as a collection of individual spherical wavelets. These characteristic behaviors are exhibited when a wave encounters an obstacle or a slit that is comparable in size to its wavelength. Similar effects occur when a light wave travels through a medium with a varying refractive index, or when a sound wave travels through a medium with varying acoustic impedance. Diffraction has an impact on the acoustic space. Diffraction occurs with all waves, including sound waves, water waves, and electromagnetic waves such as visible light, X-rays and radio waves.

What is he physical significance of diffraction of light

If magnification has a magnitude greater than 1 the image is larger than the object, and an m with a magnitude less than 1 means the image is smaller than the object. If themagnificationispositive, the image is upright compared to the object; if m is negative, the image is inverted compared to the object

Although the existence of null vector is essential for vector algebra as it acts as the essential additive inverse, there is no physical significance of null vector. Actually its direction is undeterminable.If a man applies 0 N of force, he is not applying any force so its direction can’t possibly have any physical significance.

thanks a lot

The image is 1.15 m at the back of the mirror. Magnification, m=h'/h=-v/u=-1.15m/(-5.00m)=+0.23 The image is virtual, erect and smaller in size by a factor of 0.23.Read more on Sarthaks.com - https://www.sarthaks.com/22987/a-convex-mirror-used-for-rear-view-on-an-automobile-has-a-radius-of-curvature-of-3-00m

Radius of gyration is the distance from the axis of rotation at which if instead of the whole body, a point object is placed, the system will have the same moment of inertia.It's physical significance can be explained by the fact that if a point object is placed at the radius of gyration, the motion can be considered as that of a point object and not as a continuous body. It represents the stability against the axial force.

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An excessive resistance of your high amperage circuit is an overlooked problem that cancauseyourvoltstodropin yourbatteries.

R=3.5 , f=R/2= 1.75mu= -10cm, v=?

1/f =1/v + 1/u1/1.75 = 1/v - 1/10v= 1.5 mmagnification (m)= -v/u =0.15image is real, erect and diminished...

The charge is fed into the blast furnace through the throat.

the charge os fed through throat of the furnace because in a blast furnace charge is continuosly supplied through the top of the furnace while the blast of air is blown into lower section of furnace