|
NYS Earth Science Regents Review Practice - Energy - Question 05 |
 |
 |
 |
|
Written by The Earth Science Wizard
|
|
Wednesday, 18 November 2009 00:12 |
5. Which color of the visible light spectrum could have a wavelength of 5.5 × 10–5 centimeter?
A) Green
B) Orange
C) Red
D) Yellow
Correct Answer: Option D – Yellow
The wavelength of a sinusoidal wave is the spatial period of the wave – the distance over which the wave's shape repeats. It is usually determined by considering the distance between consecutive corresponding points of the same phase, such as crests, troughs, or zero crossings, and is a characteristic of traveling waves and standing waves, as well as other spatial wave patterns.
Yellow is the color evoked by light that stimulates both the L and M (long and medium wavelength) cone cells of the retina about equally, with no significant stimulation of the S (short-wavelength) cone cells. Light with a wavelength of 570–580 nm is yellow, as is light with a suitable mixture of somewhat longer and shorter wavelengths.
Green is a color, the perception of which is evoked by light having a spectrum dominated by energy with a wavelength of roughly 520–570 nanometres. In the subtractive color system, it is not a primary color, but is created out of a mixture of yellow and blue, or yellow and cyan; it is considered one of the additive primary colors.
The color orange occurs between red and yellow in the visible spectrum at a wavelength of about 585–620 nm.
Red is any of a number of similar colors evoked by light consisting predominantly of the longest wavelengths of light discernible by the human eye, in the wavelength range of roughly 625–740 nm. Longer wavelengths than this are called infrared (below red), and cannot be seen by the naked human eye.
|
|
|
NYS Earth Science Regents Review Practice - Energy - Question 09 |
|
|
|
|
Written by The Earth Science Wizard
|
|
Wednesday, 18 November 2009 00:37 |
9. Most of the solar radiation absorbed by Earth’s surface is later radiated back into space as which type of electromagnetic radiation?
A) Ultraviolet
B) X ray
C) Infrared
D) Radio wave
Correct Answer: Option C – Infrared
Infrared (IR) radiation is electromagnetic radiation whose wavelength is longer than that of visible light (400-700 nm), but shorter than that of terahertz radiation (100 µm - 1 mm) and microwaves (~30,000 µm). Infrared radiation spans roughly three orders of magnitude (750 nm and 100 µm).
Direct sunlight has a luminous efficacy of about 93 lumens per watt of radiant flux, which includes infrared (47% share of the spectrum), visible (46%), and ultra-violet (only 6%) light. Bright sunlight provides luminance of approximately 100,000 candela per square meter at the Earth's surface.
Incorrect Options
Radio frequency (RF) is a frequency or rate of oscillation within the range of about 3 Hz to 300 GHz. This range corresponds to frequency of alternating current electrical signals used to produce and detect radio waves.
X-radiation (composed of X-rays) is a form of electromagnetic radiation. X-rays have a wavelength in the range of 10 to 0.01 nanometers, corresponding to frequencies in the range 30 petahertz to 30 exahertz (3 × 1016 Hz to 3 × 1019 Hz) and energies in the range 120 eV to 120 keV.
Ultraviolet (UV) light is electromagnetic radiation with a wavelength shorter than that of visible light, but longer than x-rays, in the range 10 nm to 400 nm, and energies from 3 eV to 124 eV. It is so named because the spectrum consists of electromagnetic waves with frequencies higher than those that humans identify as the color violet.
|
|
NYS Earth Science Regents Review Practice - Energy - Question 25 |
|
|
|
|
Written by The Earth Science Wizard
|
|
Wednesday, 18 November 2009 11:24 |
25. Which star color indicates the hottest star surface temperature?
A) Blue
B) Yellow
C) White
D) Red
Correct Answer: Option A – Blue
The emission spectrum of hydrogen is divided into a number of spectral series, with wavelengths given by the Rydberg formula. These observed spectral lines are due to electrons moving between energy levels in the atom.
In the spectral series the blue light lays on the left most side of the series and red on the right. The blue light represents higher amount of energy (temperature) representing the surface temperature of the hottest star surface.
|
|
NYS Earth Science Regents Review Practice - Energy - Question 29 |
|
|
|
|
Written by The Earth Science Wizard
|
|
Wednesday, 18 November 2009 11:35 |
29. State a possible wavelength, in centimeters, of infrared radiation.
Correct Answer:
Infrared (IR) radiation is electromagnetic radiation whose wavelength is longer than that of visible light (400-700 nm), but shorter than that of terahertz radiation (100 µm - 1 mm) and microwaves (~30,000 µm).
According to the Earth Science Reference Tables, the wavelength in centimeters of infrared radiation ranges from 7.0 × 10−5 to 5.0 × 10−2 centimeters.
|
|
NYS Earth Science Regents Review Practice - Energy - Question 30 |
|
|
|
|
Written by The Earth Science Wizard
|
|
Wednesday, 18 November 2009 11:40 |
30. The same amount of heat energy is added to equal masses of lead, iron, basalt and water at room temperature. Assuming no phase change takes place, which substance will have the smallest change in temperature?
A) Lead
B) Water
C) Basalt
D) Iron
Correct Answer: Option B – Water
Water has a very high specific heat capacity, which makes the change in temperature of water comparatively small as against lead, basalt and iron.
- The specific heat of water is 1 calorie/gram °C = 4.186 joule/gram °C
- The specific heat of iron is 0.108 Kilo Calories/Kg °C
- The specific heat of lead is 0.031 Kilo Calories/Kg °C
- The specific heat of basalt is 0.84 Kilo Joules/Kg K
Hence, options A, C and D are incorrect.
|
|
|
|
|
<< Start < Prev 1 2 3 4 5 6 Next > End >>
|
|
Page 1 of 6 |
Practice Questions