NEET Questions

Which of the following transitions in a hydrogen atom emits a photon with the longest wavelength?

What is the approximate wavelength range of X-rays?

The resolution limit of a light microscope is primarily determined by which of the following?

If the length of a wire is doubled and its radius is halved, keeping the force constant, how does the elongation change?

The Young's modulus of a material is $2 imes 10^{11} \, Pa$. A wire of this material with a cross-sectional area of $1 \, mm^2$ and length $1 \, m$ is stretched by $1 \, mm$. What is the force applied to the wire?

If the length of a wire is doubled and the radius is halved, keeping the stretching force constant, the strain energy stored in the wire becomes:

An electromagnetic wave of wavelength $\lambda$ is incident on a photosensitive surface with negligible work function. If the emitted photoelectron has mass $m$ and a de-Broglie wavelength $\lambda_d$, then what is the relationship between $\lambda$ and $\lambda_d$?

A photon of energy $E$ strikes a photosensitive material with negligible work function. An emitted photoelectron has a de Broglie wavelength $\lambda_d$. If the mass of the photoelectron is $m$, which of the following expresses the relationship between $E$ and $\lambda_d$?

A proton of mass $m$ with an initial velocity $\overrightarrow{V} = V_0 \hat{i} \left( V_0 > 0 \right)$ enters an electric field $\overrightarrow{E} = -E_0 \hat{i}$ ($E_0 =$ constant $> 0$). If $\lambda_0$ is its de-Broglie wavelength initially, then its de-Broglie wavelength at time $t$ is:

An alpha particle of mass $4m$ with an initial velocity $\overrightarrow{V} = 2V_0 \hat{i}$ enters an electric field $\overrightarrow{E} = -2E_0 \hat{i}$. If $\lambda_0$ is its initial de-Broglie wavelength, what is its wavelength after a time $t$?