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An electron, a proton and an alpha particle have kinetic energies of 16E,4E and E respectively. What is the qualitative order of their de Broglie wavelengths ? a)Ie>Ip=Ia b)Ip=Ia>Ie c)Ip>Ie>Ia d)Ia<Ie>>Ip ...

which electronic level would allow the hydrogen atom to absorb a photon but not emit one ? a)3s b)2p c)2s d)1s ...

How much force act on a body whose momentum is constant? a. 0 b. large force c. small force d. none of these ...

A force produce an acceleration of 2 m/s2 in a body A and 5 m/s2 another body B. Then the ratio of mass of A to the mass of B is a. 1/(2.5) b. 2.5 c. 2/(2.5) d. (3.5)/(2.5) ...

From a rifle of mass 4 kg,a bullet of mass 50 gm is fired with an initial velocity of 35 m/s. The initial recoil velocity of the rifle is a. 0.4375 m/s b. 0.5375 m/s c. 0.6375 m/s d. 0.3375 m/s ...

Reduce to lowest terms, (a2-b2) / ab - (ab-b2) / (ab-a2). ...

A particle moving with an initial velocity of 5 m/s i subjected to a uniform acceleration of -2.5 m/s2. Then the displacement in next 4 second will be a. 20 m b. 10 m c. 0 m d. none of these ...

Among various properties of continuous, we have ƒ is continuous function on [a,b] and ƒ(a)ƒ(b) < 0, then there exists a point c in (a,b) such that ƒ(x) = 0 equivalently if ƒ is continuous on [a,b] and x ε R is such t ...

While taking a left turn, a bike bends towrads the left while a car bends towards the right. Why does that happen? ...

The value of the magnetic moment of a particular ion is 2.83 BM. The ion is a)Fe2+ b)Ni2+ c)Mn2+ d)Co3+ ...

In PCl5 the bond angles in equatorial and axial planes are a)60° and 120° b)120° and 90° c)120° and 60° d)120° and 180° what does "equatorial and axial planes" mean here ? ...

What is the ratio of distance travelled to the displacement covered by a body along circumference of a semicircle of radius r ? ...

Four identical this metallic plates are kept closely as shown in the figure with respective charge on it. Plates 2 and 3 are connected by a conducting wire. Find the final charge distribution. *Image* ...

A boy is moving at a speed of 56 km/hr.One second later it is moving at 58 km/hr,then what is its acceleration? ...

The two ends of a uniform thin rod of length √2R and of mass 2√2kg can move without friction along a vertical circular path of radius R. The rod is released from the vertical position (ab). The force (in N) exerted by an ...

Meena and Hari observed and animal in their garden. Hari called it an insect while Meena said it was an earthworm. Choose the character from the following which confirms that it is an insect. (a) body rounded (b) body with jo ...

A body starts from rest and accelerates at a rate of 2m/s2. The distance travelled in 5 seconds is? ...

The triangle formed by (2,2),(4,4)and(3,5)is scalene but your answer is isosceles. ...

A particle is projected horizontally with a speed u from the top of a plane inclined at an angle with the horizontal. Then distance of point from the point of projection where the particle strike the plane will be - WHAT DOES ...

sin-1x+sin-1y=2Ï€/3.....then the value of x and y are ???? ...

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Is there any site where a class 8 student can learn about the Structure of atom(about orbitals) easily?? If yes, which one?????? ...

Why is the Electron affinity of chlorine greater than that of Flourine? After all, the L shell of Flourine is meant to have 8 electrons. ...

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A small sphere of mass m is released from rest in a large vessel filled with oil where it experiences a resistive force proportional to its speed i.e., F=-kv, where k is a constant and v is the velocity. (a) Find the speed of ...

In a triangle ABC, angleA is greater than angleB and A,B,C are the roots of the equation 3sinx-4sin3x-λ=0.Find the angleC.(0<λ<1) Please show the workout ...

lim (x-> 0) [f(x)+log {1-(1/ef (x))}-log (f(x))]=0. Find f (0). ...

A train starts from a station with a constant acceleration of 0.4 m/s2. A passenger arrives at a station 6 s after the end of the train left the very same point. What is the least speed at which the passenger should run to ca ...

Myopia is long-sightedness,hypermetropia is short-sightedness-it is correct but in answer it is incorrect. WHY? ...