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Worksheetsphysics
Total questions: 20
Worksheet time: 10mins
Which formula is used to determine the magnetic field strength of a straight infinitely long conductor with current at a distance a from it?
H = I / 2R
H = nI
H = I / (2πa)
H = B / μ₀
H = I( sinα₁ − sinα₂ ) / (2πa)
State the condition of interference maximum
Δ = λ / 2
Δ = (2k + 1)λ/2
Δ = 2kλ/2
Δ = 2kλ
5λ/2
A beam of light incident on a lens parallel to the principal optical axis always intersects at a single point located
at the optical centre
at the focal plane
on the lens surface
in double focus
in focus
An electron flies into a magnetic field parallel to the magnetic induction vector. How will it move in the magnetic field?
by inertia
accelerated along the magnetic induction vector
slowly along the magnetic induction vector
in a circle
in a spiral
A physical body which at any temperature absorbs all electromagnetic radiation falling on it in all ranges is called:
absolutely hard
absolutely elastic
grey
inelastic
absolutely black
Two light waves are coherent if:
ν₁ ≠ ν₂
Δφ ≠ const
Δφ = π
ω₁ = ω₂, Δφ = const
φ₁ = φ₂
Which formula is used to determine the magnetic field strength on the axis of a solenoid?
H = I / 2R
H = nI
H = I / (2πr)
H = μ₀I / (4πa)
H = I sinα / (2πa)
State the condition of diffraction minima from a single slit of width a on which light falls normally.
a sinφ = ±(2m + 1)λ / 2
sinα / sinβ = n₁
E = − dΦ / dt
a sinφ = mλ
correct answer is absent
At what angle of incidence do the reflected and incident rays make a right angle?
0°
90°
45°
30°
60°
The energy of EM radiation, emitted by a unit area of the surface at unit time in the range of frequencies from ν to ν + dν, is called:
power luminosity
absorptive ability
emittance
all answers are incorrect
capacitance
Maxwell’s first equation expresses the fact that a time-varying magnetic field produces:
a conservative electric field
a vortex electric field
a static electric potential
a gravitational field
a magnetic monopole
Total internal reflection occurs when light passes from:
denser to less dense medium at large angles
less dense to denser medium
vacuum to medium
medium to vacuum always
any medium to air
Fraunhofer diffraction is observed when:
screen is very close
source is incoherent
waves are parallel
aperture is large
light is unpolarized
The work function represents:
maximum kinetic energy
minimum energy to remove an electron
energy of photons
energy loss in metal
electric potential
Wien’s displacement law for a completely black body is expressed by the formula:
E = hν
R = σT⁴
δ = 2πΔ / λ
ε(ν, T) = CT⁵
λₘ = b / T
The Lorentz force acts on:
moving neutral particles
stationary charges
moving electric charges
photons only
conductor placed in a magnetic field
If the thickness of a lens is much smaller than its radii of curvature, this lens is called:
converging
diverging
biconvex
thin
biconcave
State the radius of the outer boundary of the m-th Fresnel zone for a spherical wave.
rₘ = √(ab / (a + b) · mλ)
r = ix+ jy+ kz
rₘ = √(bmλ)
rₘ = √((m − 1/2)Rλ)
R = Φ / S
When light is incident on the interface of two media at Brewster’s angle, the angle between the reflected and refracted rays is equal to:
30°
0°
60°
180°
90°
The work function represents:
maximum kinetic energy
energy of photons
energy loss in metal
minimum energy to remove an electron
electric potential
