red light has a frequency of 4.0x10¹⁴hz as it enters a glass its wavelength changes to 5.8x10⁷m but its frequency remains constant what is the speed of red light in this glass
Answer (1)
Speed (v) = Frequency (f) × Wavelength (λ)Given:Frequency (f) = 4.0 × 10¹⁴ Hz (remains constant)Wavelength (λ) = 5.8 × 10⁻⁷ mv = f × λ= (4.0 × 10¹⁴ Hz) × (5.8 × 10⁻⁷ m)[tex]= 2.32 × 10⁸ m/s[/tex]The speed of red light in the glass is approximately 2.32 × 10⁸ meters per second.______________________________________Note:- The speed of light in vacuum is approximately 3.00 × 10⁸ m/s.- The speed of light in glass is typically around 2/3 of its speed in vacuum, due to the refractive index of glass.Verification:Refractive index (n) = Speed in vacuum / Speed in medium= (3.00 × 10⁸ m/s) / (2.32 × 10⁸ m/s)≈ 1.29 (typical value for glass)
