Step 1: Use the Formula for Thermal Stress
Thermal stress is given by:
$$ F = Y \alpha \Delta T A $$
\( Y \) = Young’s modulus
\( \alpha \) = Coefficient of linear thermal expansion
\( \Delta T \) = Temperature change
\( A \) = Area of cross-section
Step 2: Substitute the Given Values
Given:
\( Y = 0.5 \times 10^{11} \) N/m²
\( \alpha = 10^{-5} \) °C\(^{-1}\)
\( \Delta T = 100 \)°C
\( A = 10^{-3} \) m²
Substituting these values into the formula:
$$ F = (0.5 \times 10^{11}) (10^{-5}) (100) (10^{-3}) $$
Step 3: Simplify
$$ F = 0.5 \times 10^3 \times 100 $$
$$ F = 50 \times 10^3 \text{ N} $$
Step 4: Conclusion
The compressive force developed is 50 × 10³ N.
If the monochromatic source in Young's double slit experiment is replaced by white light,
1. There will be a central dark fringe surrounded by a few coloured fringes
2. There will be a central bright white fringe surrounded by a few coloured fringes
3. All bright fringes will be of equal width
4. Interference pattern will disappear
List I (Spectral Lines of Hydrogen for transitions from) | List II (Wavelength (nm)) | ||
A. | n2 = 3 to n1 = 2 | I. | 410.2 |
B. | n2 = 4 to n1 = 2 | II. | 434.1 |
C. | n2 = 5 to n1 = 2 | III. | 656.3 |
D. | n2 = 6 to n1 = 2 | IV. | 486.1 |
The following diagram shown restriction sites in E. coli cloning vector pBR322. Find the role of ‘X’ and ‘Y’gens :