When a photon enters glass from air, which one of the following quantity does NOT change?
Show Hint
- Velocity
- Energy
- Momentum
- Wavelength
The Correct Option is B
Solution and Explanation
When a photon enters a different medium, such as from air to glass, its velocity and wavelength change, but its energy and momentum remain constant. The energy of a photon depends on its frequency, and the frequency of the photon does not change when it enters the new medium.
Step 2: Conclusion.
Thus, the correct answer is (B) Energy.
Top Questions on Elasticity
- If percentage increase in Young's modulus \(Y\) is \(1%\), percentage increase in density of material is \(0.5%\) and longitudinal wave traveling in a metallic bar has wave velocity of \(400\,\text{m/s}\), then find final velocity of the wave.
- JEE Main - 2026
- Physics
- Elasticity
- A spring of spring constant K = 15 N/m is cut into two parts of ratio of length 3 : 1. Find the spring constant of spring with smaller length (in N/m).
- JEE Main - 2026
- Physics
- Elasticity
- The length of a light string is 1.4 m when the tension on it is 5 N. If the tension increases to 7 N, the length of the string is 1.56 m. The original length of the string is ______ m.
- JEE Main - 2025
- Physics
- Elasticity
A steel wire of length 2 m and Young's modulus \( 2.0 \times 10^{11} \, \text{N/m}^2 \) is stretched by a force. If Poisson's ratio and transverse strain for the wire are \( 0.2 \) and \( 10^{-3} \) respectively, then the elastic potential energy density of the wire is \( \times 10^6\), in SI units .
- JEE Main - 2025
- Physics
- Elasticity
Two slabs with square cross section of different materials $(1,2)$ with equal sides $(l)$ and thickness $\mathrm{d}_{1}$ and $\mathrm{d}_{2}$ such that $\mathrm{d}_{2}=2 \mathrm{~d}_{1}$ and $l>\mathrm{d}_{2}$. Considering lower edges of these slabs are fixed to the floor, we apply equal shearing force on the narrow faces. The angle of deformation is $\theta_{2}=2 \theta_{1}$. If the shear moduli of material 1 is $4 \times 10^{9} \mathrm{~N} / \mathrm{m}^{2}$, then shear moduli of material 2 is $\mathrm{x} \times 10^{9} \mathrm{~N} / \mathrm{m}^{2}$, where value of x is _______ .
- JEE Main - 2025
- Physics
- Elasticity
Questions Asked in MHT CET exam
- Given the equation: \[ 81 \sin^2 x + 81 \cos^2 x = 30 \] Find the value of \( x \).
- MHT CET - 2025
- Trigonometric Identities
- If $ f(x) = 2x^2 - 3x + 5 $, find $ f(3) $.
- MHT CET - 2025
- Functions
- Evaluate the definite integral: \( \int_{-2}^{2} |x^2 - x - 2| \, dx \)
- MHT CET - 2025
- Definite Integral
- There are 6 boys and 4 girls. Arrange their seating arrangement on a round table such that 2 boys and 1 girl can't sit together.
- MHT CET - 2025
- permutations and combinations
- Evaluate the integral: \[ \int \frac{1}{\sin^2 2x \cdot \cos^2 2x} \, dx \]
- MHT CET - 2025
- Trigonometric Identities