UCSD Precise Measurements of Cosmic Background Questions Precise measurements of cosmic backgroundradiation are critical to cosmology, since anyproposed mo

UCSD Precise Measurements of Cosmic Background Questions Precise measurements of cosmic backgroundradiation are critical to cosmology, since anyproposed model of the universe…………………………. Question LQ3.2.1:
Cosmic Microwaves
u
Precise measurements of cosmic background
radiation are critical to cosmology, since any
proposed model of the universe must explain
this radiation. The CMBR has a thermal black
body spectrum at a temperature of
2.72548±0.00057 K. At about what wavelength
is this BB radiation maximum?
A)
B)
C)
D)
E)
500 nm
B) 500 µm
C) 1 mm
D) 500 mm
E) 10 m
3
Question LQ3.2.2:
PhotoElectric
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Molybdenum has a work function of
4.2 eV. Calculate the stopping
potential if the incident light has a
wavelength of 197.3 nm.
A)
B)
C)
D)
E)
1V
6.28 V
2.08 V
-3.1 V
3.1 V
V=Vstop
V=0
4
Question LQ3.3.1:
Wave-Particle Paradox
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EM radiation is best described as:
A.
B.
C.
D.
E.
particles
a wave
the field is a wave but its
detected as particles
particles with a probability
distribution given by the
square of the field.
sometimes a particle and
sometimes a wave
5
Problem LQ3.3.2:
3 Linear Polarizers
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If the polarizer
between an x and a y
polarizer is at 30
degrees to the x-axis,
what fraction of
unpolarized light will
be transmitted
through the stack of 3
polarizers?
A.
B.
C.
D.
E.
0.5
0.25
0.125
0.0675
0.09375
6

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