For an organ pipe completely closed at one end, the fundamental frequency is f. What are the frequencies of the next two higher harmonics? MCQ with Answer and Explanation
For an organ pipe completely closed at one end, the fundamental frequency is f. What are the frequencies of the next two higher harmonics?
A. 3f and 5f
B. 2f and 4f
C. 4f and 6f
D. 2f and 3f
Answer: Option A
Solution (By JKSSB Mock Tests)
An organ pipe closed at one end features a node at the closed end and an antinode at the open end. Because of these boundary conditions, it can only support odd harmonics. If the fundamental frequency (1st harmonic) is f, the next permissible frequencies are the 3rd harmonic (3f), 5th harmonic (5f), 7th harmonic (7f), and so forth.
According to Brewster's Law, when unpolarized light is incident on a transparent medium at the polarizing angle (Brewster's angle), the reflected and refracted rays are:
Explanation:
Brewster's Law states that when light hits a dielectric boundary at a specific angle of incidence (Brewster's angle, theta_p), the reflected light is completely plane-polarized. At this exact geometric condition, the angle between the reflected ray and the refracted (transmitted) ray is strictly 90 degrees.
Explanation:
Charge of electron e = 1.6 × 10⁻¹⁹ C. Number n = 1/e = 1/(1.6×10⁻¹⁹) = 6.25 × 10¹⁸. This is a huge number. Important for current (1 A = 1 C/s).
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