NEET Physics MCQs

The Planck constant is $6.626 imes 10^{-34}$ J s. Express this in units of eV s (electron-volt seconds), given 1 eV = $1.602 imes 10^{-19}$ J.

The dimensions of Planck's constant are the same as those of:

What are the dimensions of Planck's constant?

The energy of a photon is given by $E = h

u$, where$h$is Planck's constant and$

u$is the frequency. If a new quantity$X$is defined as$X = \frac{h^2

u^3}{E}$, the dimensions of$X$ are:

A physicist uses dimensional analysis to derive an expression for the energy (E) of a particle based on its mass (m), velocity (v), and Planck's constant (h). They arrive at $E = mv^2$. Why is this result incomplete?

If the speed of light $c$, Planck's constant $h$ and gravitational constant $G$ are chosen as fundamental units, then the dimensions of time in terms of these units are:

If the velocity of light $c$, gravitational constant $G$, and Planck's constant $h$ are chosen as fundamental units, then the dimensions of mass in this system are:

In Lenard's experiment, ultraviolet light of wavelength 200 nm is incident on a metal surface. The stopping potential is found to be 4V. If the wavelength is increased to 300 nm, what will be the new stopping potential? (Take $h = 6.63 imes 10^{-34}$ Js, $c = 3 imes 10^8$ m/s, $e = 1.6 imes 10^{-19}$ C)

What is the de Broglie wavelength of an electron with momentum $10^{-24} kg \cdot m/s$? (Planck's constant $h = 6.626 imes 10^{-34} J \cdot s$)

A metal surface is illuminated by light of frequency $2 imes 10^{15}$ Hz. The work function of the metal is $5$ eV. Which of the following statements is correct regarding the emission of photoelectrons?