class 12

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JEE Main

Among the following, the incorrect statement is :

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In a hydrogen like atom electron makes transition from an energy level with quantum number n to another with quantum number (n - 1). If $n>>1,$ the frequency of radiation emitted is proportional to

The forward biased conection is :

When 5V potential difference is applied across a wire of length 0.1 m, the drift speed of electrons is $2.5×10_{−4}ms_{−1}$. If the electron density in the wire is $8×10_{28}m_{−3}$, the resistivity of the material is close to :

Consider a spherical shell of radius R at temperature T. The black body radiation inside it can be considered as an ideal gas of photons with internal energy per unit volume $u=VU ∝T_{4}$ and pressure $p=31 (VU )$. If the shell now undergoes an adiabatic expansion the relation between T and R is :

The image of the line $3x−1 =1y−3 =−5z−4 $in the plane $2x−y+z+3=0$is the line

Sodium metal crystallizes in a body centred cubic lattice with a unit cell edge of 4.29 Å. The radius of sodium atom is approximately :

In the context of the Hall - Heroult process for the extraction of Al, which of the following statements is false ?

If $y=sec(tan_{−1}x)$, then $dxdy $at $x=1$is equal to