NEW
Font size
WorksheetsUnit 2 Summary
Total questions: 48
Worksheet time: 2hrs 24mins
Which one of the following parts of the atom is the smallest?
nucleus
electron
quark
Why is a neutrino so difficult to detect?
It travels at velocities faster than the speed of light
It has no electrical charge, so it does not affect nearby particles
It doesn't really exist
It has an electrical charge of (−1) and plays an active role in chemical reactions.
Electrons and neutrinos are known as the family of ___
Leptons
Hadrons
Fermions
Baryons
What are hadrons made of?
quarks
protons and neutrons
electrons, muons, and taos
Fermions
Baryons are
a type of hadron that is made of three quarks.
a type of meson that is made of two quarks.
a type of lepton like the electron and muon
atoms.
What happens when a particle meets its anti-particle?
annihilation of both particles
They combined to form a quark
They combined and form matter.
The repel and move away.
When a charge of 3 C is moved from point Y to a point X in an electric field, the work done is 15 J. What is the voltage between the point?
45 V
22.5 V
15 V
5 V
What does the following represent?
⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗
⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗
⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗
Multiplied by a billion
A piece of modern art
Uniform magnetic field directed into the screen away from you
Uniform magnetic field directed out of your screen at you
⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙
⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙
⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙
Four small particles are seen moving through an area with the magnetic field going out of the page. Which of the following statements is consistent with the diagram?
All the particles are positively charges but have different mass
All the particles have same mass, but different charges
Two particles are positive while one is negative
Two particles are negative while one is positive
You can only ascertain that all are charged
Why do the tubes in a LINAC get longer throughout the accelerator?
So the particle can be accelerated
So the polarity of the supply can be switch between each tube
So the electric field can be kept constant
So the frequency of the alternating supply can be kept constant
What is the job of the magnetic field in a cyclotron?
Create a force perpendicular to the motion of the particle, which acts a centripetal force
To accelerate the particle between the dees
To apply a force parallel to the direction of motion of the particle, which acts as the centripetal force.
So the direction of the force can be alternated every half turn
What is the energy equivalent of a mass of 0.026 kilogram?
2.34 X 10^15 J
9 X 10^16 J
1.14 X 10^-30 J
1.8 X 10^12 J
In nuclear fission, some mass is converted to energy. This causes -
final mass to be less than initial mass
final mas to be more than initial mass
final mass to be equal to initial mass
The energy of photoelectrons emitted from a metal surface can be increased by
using light of higher frequency.
using light of longer wavelength.
using light of higher intensity.
using monochromatic, polarized light.
What is the best description of 'threshold frequency'?
The minimum energy needed for electrons to escape a surface.
The maximum kinetic energy that an emitted electron has.
The minimum frequency of a photon that will cause an electron to be emitted.
The frequency that an emitted electron will have.
The only way to increase the number of photoelectrons emitted is by increasing the _________ of the light
Intensity
Wavelength
Frequency
Energy
Use the graph to find the threshold frequency.
−12×10-19 Hz
0 Hz
2×1015 Hz
4×1015 Hz
A laser with a cross section diameter of ϕ=0.50 mm has a power of P=500 mW . What is its irradiance?
I=2,0×103 W.m−2
I=2,55×103 W.m−2
I=2,55×106 W.m−2
I=2,55×109 W.m−2
What type of interference is represented in this diagram?
Constructive
Destructive
What's happening at A?
Two crests are combining to create constructive interference.
A crest and a trough are combining to create destructive interference.
Two crests are combining to create destructive interference.
A crest and trough are combining to create constructive interference.
In a Young's double slit experiment, green light is
incident on the two slits. The interference pattern is
observed on a screen. Which one of the following
changes would cause the fringes to be more closely
spaced?
Reduce the slit separation distance
Use red light instead of green light
Use blue light instead of green light
Move the screen farther away from the slits
Monochromatic coherent light shines through a
pair of slits. If the distance between these slits is
decreased, which of the following statements is/are
true of the resulting interference pattern?
I. The distance between the maxima stays the
same
II. The distance between the maxima decreases
III. The distance between the minima increases
IV. The distance between the maxima increases
I only
I and III only
II and III only
III and IV only
Two light sources are said to be coherent if they are ______.
of the same frequency
of the same frequency, and maintain a constant phase difference
of the same amplitude, and maintain a constant phase difference
of the same frequency and amplitude
Two beams of coherent light start out at the same
point in phase and travel different paths to arrive at
point 𝑃. If the maximum destructive interference is
to occur at point 𝑃, the two beams must travel paths
that differ by _______.
a whole number of wavelengths
a whole number of half-wavelengths
an odd number of wavelengths
an odd number of half-wavelengths
Light travels through a liquid at 2.25 x10^8 m/s. What is the index of the liquid?
1.33
1.0
1.523
2.45
flint glass n=1.70
barium glass n=1.60
crown glass n=1.523
water n=1.33
diamond n=2.45
Light travels from glass (n=1.66) to water, what is the critical angle for these two mediums?
53.2
48.8
37
not possible
Light travels from air to water (n=1.33), what is the critical angle?
48.8
46.4
52.4
not possible
True or False: The ground state is the highest energy state of an atom.
True
False
If an electron moves from n=4 to n=2 it ____
absorbs energy
releases energy
