answer for this qns with soln
An electromagnetic wave of frequency 1x1014 hertz is propagating along z - axis. The amplitude of electric field is 4 V/m. If = 8.8 x 10-12 C2/N-m2, then average energy density of electric field will be :
A.
35.2 x 10-10 J/m3
B.
35.2 x 10-11 J/m3
C.
35.2 x 10-12 J/m3
D.
35.2 x 10-13 J/m3
N=2 is chosen as reference of electrostatic potential energy in an he+ ion... Assuming Bohr model to be valid calculate the ionisation energy for the ion in its ground state ....
In the photoelectric experiment the collector plate is at 5V wrt the anode made of metal with work function 5ev ..the metal surface is illuminated by monochromatic light of wavelength 1000 Angstrom the minimum and maximum kinetic energy of electron teaching at collector.is
Question
Asked in: BITSAT-2018
From a sphere of mass M and radius R, a smaller sphere of radius is carved out such that the cavity made in the original sphere is between its centre and the periphery. (See figure). For the configuration in the figure where the distance between the centre of the original sphere and the removed sphere is 3R, the gravitational force between the two spheres is :
Question
Asked in: BITSAT-2018
From a sphere of mass M and radius R, a smaller sphere of radius is carved out such that the cavity made in the original sphere is between its centre and the periphery. (See figure). For the configuration in the figure where the distance between the centre of the original sphere and the removed sphere is 3R, the gravitational force between the two spheres is :
My question is how ratio can a physical quantity. In my understanding physical quantity must have magnitude (a number) and unit but sometimes ratio doesnt have any units.
Simliarly how just a scalar can be a physical quantity if theres no unit associated.
Guide me a good defination of physical quantity.
If the arithmetic mean of two numbers a and b, a > b > 0, is five times their geometric
mean, then is equal to:
Valve surrounding opening of the coronary sinus is.........
A) eustachian valve b) thebasious valve
C)mitral valve d)tricuspid valve
Which one of the following is not an essential mineral element for plants while the remaining three are?
Iron(b)
Manganese
Cadmium
Phosphorus
i was wrong
phosphorus is present in the meristem in the plants body
Let ABC be a triangle whose circumcentre is at P. If the position vectors of A, B, C
and P are
respectively, then the position vector of the orthocentre of this triangle, is :
If (10)^{9} + 2(11)^{1} (10)^{8} + 3(11)^{2} (10)^{7} +...... +10 (11)^{9} = k (10)^{9}, then k is equal to :
100
110
if is real, then the point represented by the complex number lies
either on the real axis or on a circle passing through the origin
on a circle with centre at the origin
either on the real axis or on a circle not passing through the origin
on the imaginary axis
Let be complex numbers such that and arg Then arg equals
The equation has
infinite number of real roots
no real roots
exactly one real root
exactly four real roots
if then a value of :
In the anion the two carbon-oxygen bonds are found to be of equal length. What is the reason for it?
Electronic orbitals of carbon atom are hybridised.
The bond is weaker than the bond
The anion has two resonating structures.
The anion is obtained by removal of a proton from the acid molecule
In HCOO-ion two carbon-oxygen bonds are found to be of equal length because this ion is stabilized by resonance and in resonance both C-O bonds have partial double bond character.