問題一覧
1
Light is emitted when an electron
makes a transition to a lower level
2
Both electrons and protons have equal-magnitude
charge
3
When we say energy levels in an atom are discrete, we mean that their energy levels are well defined and
separate from one another
4
The energy of a photon depends on its
frequency
5
light from a lit match originates with accelerating
electrons
6
The beam in a cathode-ray tube is composed of
electrons
7
Which color of visible light carries the most energy per photon?
violet
8
The highest frequency of visible light is
violet
9
A radio wave and a visible light wave differ only in
both of these
10
The ratio of a photon’s energy to its frequency is
planck’s constant
11
The wavelength of a particle relates to its
momentum
12
A laser cannot emit more energy than Is put into it. But in instances where stored energy can be released in a very short time, the laser
has a greater power output that power input
13
A throbbing pulse of electromagnetic radiation is called a
photon
14
Physicists find that the energy states of atoms are
discrete
15
Radiation dosage is commonly measured in
rads
16
When the nucleus of an atom emits an alpha particle, the atoms atomic number
decreases
17
X-rays are similar to
gamma rays
18
Neodymium 144/60 and is an isotope that undergoes alpha decay. What isotope is the product of this decay?
140/58 Ce
19
When uranium emits an alpha particle, the result is
thorium
20
The energy radiated by a star, such as the sun, results chiefly from
fusion reactions
21
When thorium (A=90) emits a beta particle, the resulting nucleus has atomic number
none of the above
22
By scattering alpha particles from gold, Rutherford showed the atomic nucleus to be very
both of These
23
Which of these will penetrate into lead
gamma rays
24
When ruthford directed a stream of alpha particles at a gold foil, most particles
continued through
25
Alpha particles are normally repelled by atomic nuclei because
they both have the same sign of electric charge
26
Carbon dating requires that that object being tested contain
organic material
27
Which of the following isotopes is radioactive?
carbon-14
28
Which statement about images is correct?
a virtual image cannot be formed on a screen
29
Total internal reflection an occur only when light passes from a material of high refractive index to one of low refractive index, never the other way around
true
30
Light goes from medium A to medium B. If you measure that the angle the rays make with the normal in A is less than the angle they make with the normal in B, then you can conclude that the refractive index of A is less than the refractive index of B
True
31
The image formed on the plane mirror is
at the same distance behind the mirror as the object infront of the mirror