In single slit diffraction, the width of the central maximum is:
Aequal to the width of each secondary maximum
Bhalf the width of secondary maxima
Ctwice the width of each secondary maximum
Dfour times the width of secondary maxima
JEE AdvancedPhysics
In a hydrogen-like atom with nuclear mass M and a single electron of mass m, the reduced mass is μ = mM/(m+M). If the Rydberg constant for infinite nuclear mass is R∞, the wavelength of the first line of the Lyman series (n = 2 → n = 1) is:
A1/(R∞(M+m)/(Mm) · 3/4)
B3/(4R∞(M+m)/(Mm))
C4/(3R∞)
D1/(R∞ · 3/4)
AEEEPhysics
In a transistor, the current amplification factor β = 50. If the collector current changes by 2 mA, the change in base current is:
A0.04 mA
B0.02 mA
C40 mA
D100 mA
Class 11Physics
Two forces F₁ = (3î + 4ĵ) N and F₂ = (5î - 12ĵ) N act on a particle. The angle between them is closest to:
A90°
B100°
C110°
D120°
CUETPhysics
In a series LCR circuit connected to an AC source, the resonant frequency is given by:
A1/(2π√(LC))
B2π√(LC)
C1/(2πLC)
D√(LC)
CUETPhysics
A convex lens of focal length f is placed in contact with a concave lens of focal length 2f. The combined focal length is:
A2f
Bf/2
C3f
D−f
JEE MainPhysics
Light of wavelength 4000 Å is incident on a metal surface with work function 2 eV. The maximum kinetic energy of emitted photoelectrons is: (h = 6.626 × 10⁻³⁴ J s, c = 3 × 10⁸ m/s, 1 eV = 1.6 × 10⁻¹⁹ J)
A1.1 eV
B0.6 eV
C1.8 eV
D0.3 eV
BITSATPhysics
The electric flux through a closed surface enclosing a charge q is:
A4π*q
Bε₀*q
Cq/ε₀
Dq/(2*ε₀)
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