10 दिलचस्प बातें जो आप नहीं जानते | 10 Most Amazing Facts | Facts In Hindi | #shorts

CBSE Class 10 Hindi - लेखन Most Important Questions | 26 Marks Most Expected Questions | CBSE Board 2020

Density of a unit cell is respresented as rho = (" Effective no. of atoms (s)" xx "Mass of a unit cell ")/("Volume of a unit cell ")=(Z.M)/(N_(A).a^(3)) where , mass of unit cell =mass of effectuive no . of atoms(s) or ion (s). M= At . mass// formula N_(A) = Avogadro' s no . rArr 6.0323 xx 10^(23) a= edge lemght of unit cell Silver crystallizes in a facts lattice and has a density of 10.6 g//cm^(3) . What is the length of a edge of the unit cell ?

CBSE Class 10 Hindi Most Important Questions | 5 Mark Most Expected Questions | CBSE Board 2020

The gravitational attraction between electron and proton in a hydrogen atom is weaker than the coulomb attraction by a factor of about 10^(-40) . An alternative way of looking at this fact is to estimate the radius of the first Bohr orbit of a hydrogen atom if the electron and proton were bound by gravitational attraction. You will find the answer interesting.

In a X th standard examination out of the 100 students appeared 50 passed in all the subjects, 20 passed in science subjects only and 10 passed in languages only. All the remaining students failed in all subjects. Which of the following represents this fact?

In the following figure (not to scale), angle DAB + angle CBA = 90^@ , BC = AD, AB = 20 cm, CD = 10 cm, then the area of the quadrilateral ABCD is: निम्नलिखित आकृति (जो पैमाने के अनुसार नहीं है) में, angle DAB + angle CBA = 90^@ , BC = AD, AB = 20 सेमी, CD = 10 सेमी है, तो चतुर्भुज ABCD का का क्षेत्रफल कितना होगा?