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Worksheets66-81
Total questions: 70
Worksheet time: 35mins
The distance between two adjacent points of a wave oscillating in the same phase is called...
period
wavelength (длина волны)
wave displacement
amplitude
The geometric location of points oscillating in the same phase is called...
amplitude
wave displacement
wave surface
wave speed
Specify the illumination unit.
lx
lm
lm/m^2
W
How is optical path length determined?
L=n*d
Under what condition is complete reflection observed?
when light falls from a medium that is optically denser to a medium that is optically less dense
none of the answers is correct
when light falls from a medium that is optically less dense into a medium that is optically denser
if the angle of incidence and angle of reflection are equal
Provide an expression for the refractive index of the medium.
Specify the units of measurement for optical power of the lens
A
dpt
lx
cd
The length of optical path of a light wave passing through a layer of water 2 mm thick is 2.66 mm. Find the refractive index of water.
1,0
1,33
2,33
3,0
Give the formula for the optical power of a lens.
Specify the luminosity unit.
lx
W
lm/m^2
cd
Compare the speed of propagation of red and violet rays in a vacuum
Specify the necessary condition for wave interference.
none of the answers is correct
wave coherence
presence of only light wave
non-coherence of waves
Light of wavelength 0.5 µm is normally incident on a diffraction grating. The grating period is 2 µm. What is the highest order of the spectrum that can be observed using this grating?
2
4
5
6
If a plane wave falls on an obstacle, and the diffraction pattern is observed on a screen located in the focal plane of a collecting lens installed in the path of light passing through the obstacle, then this is:
Fresnel diffraction
Fraunhofer diffraction
diffraction by a spatial grating
>light dispersion
Specify Malus's law
>Compare the speed of propagation of red and violet rays in water. Сравните скорость распространения красного и фиолетового лучей в воде.
A device that converts natural light into plane-polarized light is called:
spectrometer
interferometer
polarizer
ammeter
The radio transmitter of the “Vostok” satellite ship operated at a frequency of 20 MHz. What is the wavelength it emitted. (c = 3 * 10^8 m/s)
2/3 m
15 m
2/ 30 m
0,15 m
Waves propagate in an elastic medium with speed V = 100 m/s. The distance between the two closest points of the medium, the oscillation phases of which are opposite, is 1 m. Determine the oscillation frequency.
20 Hz
100 Hz
50 Hz
5 Hz
A spherical wave from a point source propagates in a medium without absorption and at a distance of 1 m from the source has an amplitude of 10^-8 m. What is the amplitude of the wave at a distance of 10^-3 m from the source?
>10^-11 м
10^-10 м
10^-8 м
10^-5 м
In what period of time will a sound wave travel a distance of 7.7 km in water if the wavelength is 7 m and the vibration frequency is 220 Hz?
>5 s
22 s
11 s
49 s
Wave equation (m) is given. How long does it take for a wave to travel a distance equal to the wavelength?
>0,1 s
8 s
2π s
20π s
The wave equation is: m. What is the phase speed of the wave?
0,5 m/s
2π m/s
4 m/s
π m/s
Determine the length of the segment on which the same number of wavelengths of monochromatic light fit in a vacuum as they fit on a segment = 5 mm in glass. The refractive index of glass is 1.5.
3,5 mm
4,5 mm
5,5 mm
7,5 mm
>The max angle of total reflection when light passes from an unknown medium into air is 30⁰. Determine the refractive index of this medium.
2,5
2,0
1,0
2,2
How will the angle between the incident on flat mirror and reflected rays change when the angle of incidence decreases by 5⁰?
will decrease by 2.5⁰
will decrease by 10⁰
will increase by 5⁰
will increase by 10⁰
Light passes through the diamond plate, the optical path length of which is 12.1 mm. The refractive index of diamond is 2.4. Find the thickness of the plate.
4 mm
1 mm
2 mm
5 mm
At what angle must a ray hit a plane mirror so that the reflected ray is perpendicular to the incident one?
A ray of light falls on the air-glass interface at an angle of 60⁰. Find the angle of refraction if the refractive index of glass is 3^1/2
10⁰
30⁰
45⁰
60⁰
If light from air is normally incident on a thin film of thickness d and refractive index n, then the optical path difference in the reflected light will be equal to:
When light falls on the interface between two media at the Brewster angle, the angle between the reflected and refracted rays is equal to....
30⁰
45⁰
60⁰
90⁰
The critical angle of total reflection at the glass-liquid interface is 𝑖𝑐𝑟 = 650. Determine the refractive index of the liquid if the refractive index of glass is n=1, (sin65⁰=0.91).
1,60
1,00
1,36
1,45
A ray of light falls on a flat interface between two media at an angle of 60⁰ and is refracted at an angle of 30⁰. Find the ratio of the refractive indices of the second medium to the first.
(2/3)^1/2
(3/2)^1/2
3^1/2
2^1/2
The angle between the optical axes of the polarizer and analyzer is 30⁰. Determine the ratio of the intensities of the light passed through them if the angle between the optical axes becomes equal to 45⁰.
3,0
1,0
1,5
>2,0
At what frequency do ships transmit SOS distress signals if, according to International Agreement, the length of radio waves should be 600 m?
6 МHz
1,5 МHz
0,5 МHz
3 МHz
The electromagnetic wave equation is given E=32cos(106πt-2πx) V/m. What is the wavelength?
2π m
1 m
106 m
3,2 m
The electromagnetic wave equation is given E=0.5cos(106 πt-2πx) V/m. What is the period of oscillation?
0,5 μs
2π μs
1 μs
2π μs
A beam of light comes out of the glass into a vacuum. The critical angle is 30⁰. Determine the speed of light in glass.
0,8×10^8 m/s
0,5×10^8 m/s
1,5×10^8 m/s
A lamp with a luminous intensity of 100 cd hangs at a height of 1 m above the center of a round table with a radius of 1 m. Find the illumination at the edge of the table.
100 lx
50 lx
30,2 lx
10× lx
A beam of light comes out of the glass into a vacuum. Critical angle 𝑖𝑐𝑟 = 420. Determine the speed of light in glass (sin42⁰=0.67).
201 Мm/s
331 Мm/s
448 Мm/s
600 Мm/s
A parallel beam of light with a wavelength λ = 0.6 µm falls normally on a diaphragm with a round hole with a diameter of d=5 mm. Determine the distance from the observation point to the hole if the hole opens three Fresnel zones.
1,12 m
3,47 m
5,21 m
6,15 m
Monochromatic light falls normally on a slit of width a=0.005 mm. The angle of deflection of the rays corresponding to the fifth dark diffraction line is j=30⁰. Determine the wavelength of the incident light.
0,3 μm
0,4 μm
0,5 μm
0,6 μm
What is the optical difference in the path of two coherent monochromatic waves in a substance if the phase difference is 0.6π?
0,6λ
0,3λ
0,4λ
0,35λ
Determine the radius of the third Fresnel zone if the distance from a point light source (λ= 0.6 μm) to the wave front and from the wave front to the observation point is 1.5 m.
0,11 mm
0,55 mm
1,16 mm
0,55 mm
A parallel beam of light with a wavelength λ = 0.6 µm falls normally on a diaphragm with a round hole with a diameter of d=5 mm. Determine the distance from the observation point to the hole if the hole opens two Fresnel zones.
1,12 m
3,47 m
6,15 m
5,21 m
Natural light passes from air into some optical medium with a refractive index . At what angle of incidence will the reflected beam be completely plane polarized?
30⁰
45⁰
60⁰
90⁰
What is the mass of a particle with charge -2e moving from an initial state of rest with acceleration a in a uniform electric field with intensity 3E?
On the capacitor body it is written: 100 µF, 200 V. The maximum energy that can be supplied to the capacitor is:
2 J
4 J
3 J
2.25 J
The potential difference that must be created to stop electron moving at speed V is equal to:
The charge of a particle of mass m, accelerated by a potential difference in an electric field from a state of rest to a speed V, is equal to:
Two point charges are in the air. If the distance between them to halve and placed them in a dielectric medium with ε = 3, then the interaction energy of these charges:
will increase by 2 times
will decrease by 1.5 times
will be reduced by 3 times
will be reduced by 2 times
The work of the electric field to move a charge is characterized by the expression:
The modulus of the electric field at the point where the charge of 10^-7 C is located is equal to 5 V/m. Determine the force acting on the charge.
5∙10^-7 N
10^-8 N.
5∙10^7 N.
6∙10^7 N.
Let the charge move in a uniform field E=2 V/m along a line of 0.2 m. Find the potential difference.
U=0.1 V.
U=0.4 V.
U=10 V.
U=40 V.
Indicate the condition for homogeneity of the electric field.
How must the distance between point electric charges be changed when one of them increases 4 times but that the interaction force remains the same?
decrease by 2 times
decrease by 4 times
increase 2 times
increase 4 times
The electric field created by a sphere of radius R at a distance r >R from the center of the sphere:
Potential energy of a charge 0 q located at a distance r from a point charge q.
Potential of a charged spherical surface of radius R.
>Electrical capacity of isolated metalical sphere of radius R, located in an infinite medium with dielectric constant
The conductor carries a charge of 10 µC. The potential of the conductor is 5 V. What is the capacitance of the conductor?
5 µF
2*10^6 F
2* 10^-6 F
5*10^-2 F
A flat-plate air capacitor is connected to a current source. How will the energy of the capacitor change when the distance between the plates is halved?
will be reduced by 2 times
will not change
will increase by 2 times
will be reduced by 4 times
How must the distance between two point charges be changed when transferring them from kerosene to air so that the energy of interaction between the charges remains the same? (for kerosene ε=2)
decrease by 3 times
decrease by 1.5 times
increase 2 times
the distance must be left unchanged
Two point charges 6q and 2q interact with a force of 0.3 N. What will the force be equal to after the charges have been connected and separated to the same distance?
0.2 N
0.3 N
0.4 N
0.5 N
How will the electric field strength of a point charge change if the distance between the charges is increased by 5 times?
will increase by 25 times
will not change
will be reduced by 25 times
How will the capacitance of a flat capacitor change if the space between the plates is filled with a dielectric with ε =7?
will be reduced by 49 times
will not change
will increase by 49 times
will increase by 7 times
Determine the speed of a particle of mass 2m and charge -e, for which the “blocking” potential difference is equal to
Which of the following expressions characterizes the voltage between two points in a uniform electric field?
Two point electric charges q and 2q at a distance r from each other are attracted with a force F. With what force will the charges 2q and 2q be attracted at a distance 2r?
F/2
2F
4F
F/8
The electric field between parallel oppositely charged metal plates in the air has energy W. What energy will the field between these plates have after filling the space between them with a dielectric with dielectric constant ε=4?
W/2
W/4
2W
4W
