QUESTION 1 A beam of light traveling in air is incident on a transparent plastic at an angle of
incidence of 26o. What is the angle of refraction if the index of refraction of the material
is 1.41? QUESTION 2 An object is 25 cm from a thin lens with a focal length of 15 cm. Where is the
image formed?
QUESTION 3 A photon is incident on a metal that has a work function of 6.80 eV. If the
longest wavelength of light is emitted, what type of light is this?
QUESTION 4 If a circuit has a total resistance of 24
and 2.5 x 1023 e charges flow past a
terminal point in 2.0 minutes, what is the applied voltage?
QUESTION 5 A magnetic flux of 50 Wb increases to 100 Wb in 10 seconds, what is the
induced emf?
QUESTION 6 If light is traveling from a material with an index of refraction of 1.57 into air,
what is the critical angle for total internal reflection?
QUESTION 7 What is the photon energy of blue light has an energy of 5.68x10 -19 J, what is its
wavelength?
QUESTION 8 An electron is accelerated from rest to a speed of 7.89 x 106 m/s, what
potential difference did it cross? QUESTION 9 If an energy intensity of 2000 W is exerted by a spherical source what will be
its average power output at a distance of 12 m from it?
QUESTION 10 The energy of a 2.00 keV electron is known to within ±3.00%. How
accurately can its position be measured?
QUESTION 11 A radioactive sample has a half-life of 10.0 min. If the sample decrease by
a factor of 1/16 how much time has passed?
QUESTION 12 If a long current carrying wire created a magnetic field of 1.2 x 10-7 T, what
is the current if you are 12.0 cm from it?
QUESTION 13 The mass of a proton is 1.6726 × 10-27 kg and the mass of a neutron is 1.6749 × 1027
kg. A proton captures a neutron forming a deuterium nucleus. One would expect
the mass of this nucleus to be:
QUESTION 14 A circuit has two resistor in series. The first is 1000
and the second is 10,000
. If the applied voltage is 12.0 V what is the power dissipated in each resistor?
QUESTION 15 If 4.0 × 1018 atoms decay with a half-life of 9.2 years, how many are remaining after
15.2 years?
QUESTION 16 An atom has 97 protons and 251 nucleons. If it undergoes alpha decay, what
are the number of protons and neutrons, respectively, in the daughter
nucleus?
QUESTION 17 In the ground state, the quantum numbers (n, l, m l, ms) for hydrogen are,
respectively,
QUESTION 18 How many neutrons are produced? QUESTION 19 The work function of a material is 3.5 eV. If the material is the illuminated with
monochromatic light (l = 300 nm), what are:
a) The stopping potential
b) The cutoff frequency
QUESTION 20 See the figure. If net force on the 1 nC charge is zero. What is q? (n is nano and
means 10-9) QUESTION 21 A radioactive sample has a half-life of 2.5 min. What fraction of the
sample is left after 40 min?
QUESTION 22 An atom has 8 protons and 17 nucleons. If it undergoes beta - decay,
what are the number of protons and neutrons, respectively, in the
daughter nucleus?
QUESTION 23 In the nuclear reaction e- + e+ (assume the particles are not moving to begin with),
what is the net energy released in keV?
QUESTION 24 If the force between two charges decreases by a factor of 100 because
the charges are moved further apart by a factor of ----- QUESTION 25 Calculate the binding energy of

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