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Total questions: 40
Worksheet time: 20mins
The relation n1sinθ1=n2sinθ2, which applies as a ray of light strikes an interface between two media, is known as:
Gauss’ law
Snell’s law
Faraday’s law
Cole’s law
law of sines
When light passes from air to glass, it bends:
toward the normal without changing speed
toward the normal and slows down
toward the normal and speeds up
awayfrom the normal and slows down
awayfrom the normal and speeds up
The index of refraction of a substance is:
the speed of light in the substance
the angle of refraction
the angle of incidence
the speed of light in vacuum divided by the speed of light in the substance
measured in radians
The separation of white light into colors by a prism is associated with:
total internal reflection
partial reflection from each surface
variation of index of refraction withwavelength
a decrease in the speed of light in the glass
selective absorption of various colors
When you stand in front of a plane mirror, your image is:
real, erect, and smaller than you
real, erect, and the same size as you
virtual, erect, and smaller than you
virtual, erect, and the same size as you
real, inverted, and the same size as you
A concave spherical mirror has a focal length of 12cm. If an object is placed 6cm in front of it the image position is:
4cm behind the mirror
4cm in front of the mirror
12cm behind the mirror
12cm in front of the mirror
at infinity
Which instrument uses a single converging lens with the object placed just inside the focal point?
Camera
Compound microscope
Magnifying glass
Overhead projector
Telescope
What type of eyeglasses should a nearsighted person wear?
diverging lenses
converging lenses
double convex lenses
bifocal lenses
plano-convex lenses
In a Young’s double-slit experiment, light ofwavelength 500nm illuminates two slits that are separated by 1mm. The separation between adjacent bright fringes on a screen 5m from the slits is:
0.10cm
0.25cm
0.50cm
1.0cm
none of the above
In a Young’s double-slit experiment the center of a bright fringe occurs wherever waves from the slits differ in phase by a multiple of
pi/4
pi/2
pi
3pi/4
2pi
The index of refraction of benzene is 1.80. The critical angle for total internal reflection, at a benzene-air interface, is about:
56◦
47
34
22
18
A ball is held 50cm in front of a plane mirror. The distance between the ball and its image is:
100cm
150cm
200cm
0cm
50cm
The image produced by a convex mirror of an erect object in front of the mirror is always:
virtual, erect, and larger than the object
virtual, erect, and smaller than the object
real, erect, and larger than the object
real, erect, and smaller than the object
none of the above
Two thin lenses (focal lengths f1 and f2) are in contact. Their equivalent focal length is:
f1+f2
f1f2/(f1+f2)
1/f1+1/f2
f1−f2
f1(f1−f2)/f2
The Sun subtends 0.5◦ as seen from Earth. The diameter of its image, using a 1.0-m focal length lens, is about:
10cm
2cm
1cm
5mm
1mm
An erect object is located between a concave mirror and its focal point. Its image is:
real, erect, and larger than the object
real, inverted, and larger than the object
virtual, erect, and larger than the object
virtual, inverted, and larger than the object
virtual, erect, and smaller than the object
As an object is moved from the center of curvature of a concave mirror toward its focal point its image:
remains virtual and becomes larger
remains virtual and becomes smaller
remains real and becomes larger
remains real and becomes smaller
remains real and approaches the same size as the object
If two light waves are coherent
their amplitudes are the same
their frequencies are the same
their wavelengths are the same
their phase difference is constant
the difference in their frequencies is constant
A concave spherical mirror has a focal length of 12cm. If an object is placed 18 cm in front of it the image position is:
7.2cm behind the mirror
7.2cm in front of the mirror
36cm behind the mirror
36cm in front of the mirror
at infinity
An erect object is placed on the central axis of a thin lens, further from the lens than the magnitude of its focal length. The magnification is +0.4. This means:
the image is real and erect and the lens is a converging lens
the image is real and inverted and the lens is a converging lens
the image is virtual and erect, and the lens is a diverging lens
the image is virtual and erect, and the lens is a converging lens
the image is virtual and inverted and the lens is a diverging lens
In the equation E=mc2, the letter “c” stands for
. the chemical energy in the system under study
the potential energy in the system under study
. the speed of light
the kinetic energy in the system under study.
Rank following electromagnetic radiations according to the energies of their photons, from least to greatest.
1. blue light 2. yellow light 3. x rays 4.radiowaves
1, 2, 3, 4
4, 2, 1, 3
4, 1, 2, 3
3, 2, 1, 4
3, 1, 2, 4
The wavelength of light beam A is twice the wavelength of light beam B. The energy of a photon in beam A is:
half the energy of a photon in beam B
one-fourth the energy of a photon in beam B
equal to the energy of a photon in beam B
twice the energy of a photon in beam B
four times the energy of a photon in beam B
Which of the following electromagnetic radiations has photons with the greatest energy?
blue light
yellow light
x rays
radiowaves
microwaves
The intensity of a uniform light beam with awavelength of 500nm is 2000W/m2. The photon flux (in number/m2· s) is about:
5×10^17
5x10^19
5x10^21
5x10^23
5x10^25
In a photoelectric effect experiment at a frequency above cut off, the number of electrons ejected is proportional to:
their kinetic energy
their potential energy
the work function
. the frequency of the incident light
the number of photons that hit the sample
Take the potential energy of a hydrogen atom to be zero for infinite separation of the electron and proton. Then the ground state energy is−13.6eV. The energy of thefirst excited state is:
0
−3.4eV
−6.8eV
−9.6eV
−27eV
The atomic number of an element is:
the whole number nearest to its mass
. the number of protons in its nucleus
the nearest whole number of hydrogen atoms having the same mass as a single atom of the given element
the number of neutrons in its nucleus
its order of discovery
Let Z denote the atomic number andAdenote the mass number of a nucleus. The number of neutrons in this nucleus is:
Z
A−Z
A−2Z
A
2A−Z
The isotopes of an element:
cannot be separated at all
occur well separated in nature
have similar chemical behavior
cannot be separated by physical methods
have equal masses
If a nucleus has massM, Zprotons (massmp), andNneutrons (massmn), its binding energy is equal to:
Mc2
(M−Zmp−Nmn)c2
(Zmp+Nmn−M)c2
(Zmp+Nmn)c2
(Zmp−M)c2
Bromine, with atomic mass 79.942u, is composed of nearly equal amounts of two isotopes, one of which contains 79 nucleons per atom. The mass number of the other isotope is:
78
79
80
81
82
The half-life of a radioactive substance is:
half the time it takes for the entire substance to decay
usually about 50years
the time for radium to change into lead
calculated fromE=mc^2
the time for half the substance to decay
Which expression correctly describes the radioactive decay of a substance whose half-life isT?
N(t)=N0.e^(−(tln 2)/T)
N(t)=N0.e^−t/T
N(t)=N0.e^−tT
N(t)=N0.e^−tTln 2
N(t)=N0e^−t/Tln 2
Radioactive polonium,214Po (Z= 84), decays by alpha emission to:
214Po (Z= 84)
.210Pb (Z= 82)
.214At (Z= 85)
218Po (Z= 84)
.210Bi (Z= 83)
A nucleus with mass numberAand atomic number Z undergoes β− decay. The mass number and atomic number, respectively, of the daughter nucleus are:
A, Z−1
A−1,Z
A+1,Z−1
A, Z+1
A, Z−1
Most of the energy produced by the Sun is due to:
nuclearfission
nuclear fusion
chemical reaction
gravitational collapse
induced emfs associated with the Sun’s magneticfield
Aluminum has atomic number 13, helium has atomic number 2, and silicon has atomic number 14. In the nuclear reaction 27Al +4He→30Si + ( ) the missing particle is:
an α particle
a positron
an electron
a proton
a neutron
A hole refers to:
. a proton
a positively charged electron
an electron that has somehow lost its charge
a microscopic defect in a solid
the absence of an electron in an otherwisefilled band
When a hydrogen atom makes the transition from the second excited state to the ground state (at −13.6eV) the energy of the photon emitted is:
. 0
1.5eV
9.1eV
12.1eV
13.6eV
