Questions
10. Microwave ovens use radiation with a
wavelength
( ) about one micron
( ) same as radar
( ) same as lasers
( ) same as AM or FM radios
1. Radio waves and x-rays have the:
same frequency
same speed
same wavelength
same energy
none of the above
2. The energy of a photon depends on
color
direction
velocity
width
11. The microwaves in a microwave oven
mostly heat
( ) carbon
( ) air
( ) water
( ) oxygen
3. Most of the energy of an ordinary tungstenfilament light bulb is emitted in the color:
( ) ultraviolet
( ) green
( ) red
( ) infrared
12. MRI maps the distribution of which element
to produce an image?
( ) Iodine
( ) Carbon
( ) Calcium
( ) Hydrogen
5.
A tungsten light bulb says “100 watts”
on it. About much power is actually emitted as
visible light?
( ) 16 Watts
( ) 40 Watts
( ) 100 Watts
( ) 220 Watts
13. Which of the following is best for seeing the
calcium in bones?
( ) x-ray
( ) MRI
( ) PET scan
( ) EEG
14. Which of the following exposes a person to
the kind of radiation that can cause cancer?
(Mark all that apply)
( ) Computer-Aided Tomography (CAT
Scans)
( ) Magnetic Resonance Imaging (MRI)
( ) Positron-Emission Tomography (PET)
( ) Thermography
6.
As an object gets hotter and hotter, the
color of its glow will change from
( ) white, to yellow, to red, to blue
( ) blue, to white, to yellow, to red
( ) red, to yellow, to white, to blue
( ) yellow, to white, to blue, to red
( ) none of the above
7.
Sunlight is brightest in which color:
( ) UV
( ) red
( ) green
( ) blue
( ) IR
15. Which of the following uses antimatter:
( ) CAT scan
( ) MRI
( ) PET scan
( ) x-ray
16. This technique was used to view illegal
immigrants inside a truck:
X-ray
X-ray backscatter
Ultrasound
Thermography
9. For the last million years, the climate has
been generally:
( ) cold, with brief warm periods
( ) warm, with brief cold periods
( ) about half warm and half cold
( ) not known, although we hope to find out soon
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17. This technique requires the ingestion or
injection of a radioactive isotope, and can be
used to detect abnormalities in the thyroid:
CAT scan
PET scan
MRI
X-ray backscatter
( ) the Earth spins
( ) there is not enough iron
( ) magnets do not occur naturally
The Earth flips its magnetism, on average,
approximately:
( ) once every 11 years
( ) twice every million years
( ) once every billion years
( ) never (at least not yet)
18. This technique is the most common used to
detect brain abnormalities:
CAT scan
PET scan
MRI
Thermography
The Earth’s magnetic flips are used for
( ) creating new permanent magnets
( ) proving the Earth has a solid iron core
( ) generate useful power
( ) geologic dating
19. This technique makes use of many X-ray
angles and a computer:
X-ray backscatter
Thermography
CAT scan
PET scan
Electricity will heat a wire if it has
( ) high voltage
( ) high current
( ) high frequency
( ) DC rather than AC
20. Which of the following is a typical energy
for an x-ray?
( ) 1 eV
( ) 1000 eV
( ) 10,000 eV
( ) 1,000,000 eV
Why are we not harmed when we put our hands
across a car battery?
( ) the battery has low energy
( ) the battery has high resistance
( ) the battery has low current
( ) we have high resistance
21. Bats navigate in caves by using
( ) ultrasound
( ) IR
( ) blacklight
( ) radar
To get a spark, you normally need:
( ) High voltage
( ) High current
( ) Low resistance
( ) Alternating Current
22. Remote control of a TV is usually done
using
( ) UV
( ) IR
( ) microwaves
( ) X-rays
You can demagnitize a natural magnet
( ) by placing it on a TV or Computer screen
( ) by placing it in a very strong electric field
( ) by heating it above the Curie point
( ) none of the above
Theoretically, the Earth should not have a
permanent magnetic field because:
( ) its interior is too hot
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