Q1. What happens to the wavelength of light when it enters a denser medium?
A. Increases
B. Remains the same
C. Becomes zero
D. Decreases
Q2. Why does the wave model predict that light bends away from the normal when entering a rarer medium?
A. Amplitude increases
B. Frequency decreases
C. Wavelength remains constant
D. Speed increases
Q3. Why does the intensity of light not depend on its speed when it enters a denser medium?
A. Frequency increases
B. Wavelength remains constant
C. Amplitude determines intensity
D. Speed equals frequency
Q4. What is the phase difference between two coherent waves resulting in destructive interference?
A. \( 0 \)
B. \( \pi/2 \)
C. \( \pi \)
D. \( 2\pi \)
Q5. What is the path difference for the second dark fringe in a double-slit experiment?
A. \( \lambda \)
B. \( \frac{3\lambda}{2} \)
C. \( \frac{\lambda}{2} \)
D. \( 2\lambda \)
Q6. What is the angular position of the second minimum in a single-slit diffraction pattern if the slit width is \( 3.0 \, \mu\text{m} \) and the wavelength is \( 600 \, \text{nm} \)?
A. 20°
B. 23.6°
C. 30°
D. 15°
Q7. Why does light exhibit both interference and diffraction despite traveling in straight lines in everyday observations?
A. Small wavelength relative to obstacles
B. High frequency
C. Constant speed
D. Large amplitude
Q8. What is the phase difference corresponding to a path difference of \( 9\lambda/4 \) in a double-slit experiment?
A. \( 5\pi \)
B. \( 4\pi \)
C. \( \frac{9\pi}{2} \)
D. \( \frac{7\pi}{2} \)
Q9. What is the phase difference corresponding to a path difference of \( 5\lambda/8 \) in a double-slit experiment?
A. \( \pi \)
B. \( \frac{3\pi}{2} \)
C. \( \frac{5\pi}{4} \)
D. \( 2\pi \)
Q10. What is the frequency of light with a wavelength of \( 540 \, \text{nm} \) in air, given the speed of light in air is \( 3.0 \times 10^8 \, \text{m/s} \)?
A. \( 5.0 \times 10^{14} \, \text{Hz} \)
B. \( 5.56 \times 10^{14} \, \text{Hz} \)
C. \( 6.0 \times 10^{14} \, \text{Hz} \)
D. \( 4.5 \times 10^{14} \, \text{Hz} \)
Q11. What is the wavelength of light in a medium with refractive index 1.75 if its wavelength in vacuum is \( 700 \, \text{nm} \)?
A. 400 nm
B. 700 nm
C. 350 nm
D. 525 nm
Q12. What is the direction of rays relative to the wavefront in a light wave?
A. Parallel
B. At 45°
C. Random
D. Perpendicular
Q13. What is the intensity of two incoherent light sources each of intensity \( I_0 \) when combined at a point?
A. \( 4I_0 \)
B. \( I_0 \)
C. \( 0 \)
D. \( 2I_0 \)
Q14. What is the intensity at a point in a double-slit experiment where the phase difference is \( \pi/2 \), if the maximum intensity is \( 4I_0 \)?
A. \( 4I_0 \)
B. \( I_0 \)
C. \( 2I_0 \)
D. \( 0 \)
Q15. What is the wavelength of light in a medium with refractive index 1.2 if its wavelength in vacuum is \( 600 \, \text{nm} \)?
A. 500 nm
B. 600 nm
C. 400 nm
D. 720 nm
Physics — Wave Optics
Set 3 of 22
22:30
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