1
WB JEE 2021
+1
-0.25 From dimensional analysis, the Rydberg constant can be expressed in terms of electric charge (e), mass (m) and Planck constant (h) as [consider $${1 \over {4\pi {\varepsilon _0}}} \equiv 1$$ unit]
A
$${{{h^2}} \over {m{e^2}}}$$
B
$${{m{e^4}} \over {{h^2}}}$$
C
$${{{m^2}{e^4}} \over {{h^2}}}$$
D
$${{m{e^2}} \over {{h^2}}}$$
2
WB JEE 2020
+1
-0.25 The frequency v of the radiation emitted by an atom when an electron jumps from one orbit to another is given by v = k$$\delta$$E, where k is a constant and $$\delta$$E is the change in energy level due to the transition. Then, dimension of k is
A
$${\left[ {M{L^2}{T^{ - 2}}} \right]}$$
B
the same dimension of angular momentum
C
$${\left[ {M{L^2}{T^{ - 1}}} \right]}$$
D
$$\left[ {{M^{ - 1}}{L^{ - 2}}T} \right]$$
3
WB JEE 2019
+1
-0.25 The correct dimensional formula for impulse is given by
A
ML2t$$-$$2
B
MLT$$-$$1
C
ML2t$$-$$1
D
MLT$$-$$2
4
WB JEE 2019
+1
-0.25 The density of the material of a cube can be estimated by measuring its mass and the length of one of its sides. If the maximum error in the measurement of mass and length are 0.3% and 0.2% respectively, the maximum error in the estimation of the density of the cube is approximately
A
1.1%
B
0.5%
C
0.9%
D
0.7%
WB JEE Subjects
Physics
Mechanics
Electricity
Optics
Modern Physics
Chemistry
Physical Chemistry
Inorganic Chemistry
Organic Chemistry
Mathematics
Algebra
Trigonometry
Coordinate Geometry
Calculus
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