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What is unit of Astronomical distance ?
A) light year
B) angstrom
C) weber
D) lux
Step by step
Solved in 2 steps
- Illuminance is a measurement of how much light is incident on a surface. It varies with the square of the distance of the object from the light source. Illuminance (lx)- amount of light falling on 1 m^2 area Please answer numbers 1 and 2 1. Compute for the illuminance in your room. 2. Search for the ideal illuminance in the areas of the house (living area) and give area in your house that needs more light. Kindly give explanation how'd you come up with your answer.When two objects are far away, an observer moving will see a shift of the closest object relative to the farthest object. This shift is known as a.triangulation. b.parallax. c.a baseline. d.a degree. e.an arc second. What advantages do large telescopes have over smaller ones? a.larger collecting areas b.both superior angular resolution and less aberration c.superior angular resolution d.less aberration e.better exposure times What is the name given to a day which uses the stars as a reference? a.solar day b.diurnal day c.sidereal day d.orbital day e.none of the mentioned choicesView Policies Current Attempt in Progress An astronomical unit (AU) is equal to the average distance from Earth to the Sun, about 92.9 x 10 mi. A parsec (pc) is the distance at which a length of 1 AU would subtend an angle of exactly 1 second of arc (the figure). A light-year (ly) is the distance that light, traveling through a vacuum with a speed of 186000 mi/s, would cover in 1.0 year. Express the Earth-Sun distance in (a) parsecs and (b) light- years. An angle of exactly 1 second 1 pc -1 AU 1 pc (a) Number i Units (b) Number i Units
- 3. A radio station transmits radio waves that has a frequency (v) of 89.5 MHz (megahertz). (A) What is the wavelength (2) of these radio waves in units of meters (m)? I Hints: There is a unit conversion involved in the problem for 'megahertz' to Hertz. Which equation from Chapter 5 should we use to solve for the wavelength here? What is the value of the speed of light (c)? Show work for each step. Include units and observe proper sig figs and rounding in your answer. (B) Calculate the energy (Ephoton) of a single photon of these radio waves in units of Joules. Hints: Which equation from Chapter 5 should we use here? What is the value of the Planck's constant (h)? Show work for each step. Include units and observe proper sig figs and rounding in your answer.d. Diameter of the Sun I h d Standing on the beach at sunset, you extend the tip of your finger at your full arm length from your face, covering the Sun. Upon moving your finger around, you find that only about half of its width is needed to completely cover the Sun's diameter. You measure your finger width to be 0.5 inches. You know your arm length to be 28.0 inches You have be told that the Sun is approximately 93 million miles away. Use this information to determine the approximate diameter of the Sun, filling in the table below with the proper quantities measure in meters. 1=½ finger width X Arm length g = eye level d = object height A = angle from eye f= object height from h= Diameter of the Sun %3D %3D distance 93x10 mi level to top of eye level object OR 1.023 0127mLight year is a unit of A. time B. distance C. light D. intensity of light
- Explain h to make a simple astronomical observation that would determine your latitude.Why are light-years more convenient than miles, kilometres, or astronomical units for measuring certain distances?3. The sun is 93,000,000 miles away from the earth. How long would it take for the sun's light to reach the earth? Show your computation. Express your answer in minutes.
- 2. The nearest star to earth is the Proxima Centauri. It is approximately 4.2 lightyears away from our planet. a) Express this distance in km and in the astronomical unit. b) Calculate the time that it will take for this star's light to reach earth. 3. Find the weights of gelatin and butter contained in a cubic box with a side dimension of 0.03 cm. Gelatin has a density of 79 Ib/ft² while butter has a density of 53 lb/ft’.1, What is the diameter, in meters, of the earth's orbit around the sun? Written in scientific notation, the diameter is________ times 10 to the power of_____ meters. 2, According to Roemer, about how many seconds does it take light to travel across the diameter of the earth's orbit? Do NOT include units of measure. 3, How do these two quantities determine the speed of light? 4, When ultraviolet light shines on glass, what does it do to electrons in the glass structure? 5, When energetic electrons in the glass structure vibrate against neighboring atoms, what happens to the energy of vibration? 6, What happens to the energy of a vibrating electron that does not collide with neighboring atoms? 7, How is the speed of light in glass affected by the succession of time delays that accompany the absorption and re-emission of light from atom to atom in the glass? 8, When looking at a shadow, the_________ is darker than the __________ 10, How does the speed of light compare in water,…1. Light with a frequency of 7.26x 10^14 Hz lies in the violet region of the visible spectrum. What is the wavelength of this frequency of light? Answer in units of nm. Answer: Frequency ________ nm 2. What is the frequency of a light that has a wavelength of 537 nm? Indicate your exponents using the symbol ^. Answer: Frequency = ________ Hz 3. The wavelength for the detection of lithium by its atomic emission spectra is 680.8 nm. What is the energy of the photon of radiation that corresponds to this emission line for lithium in joules? Indicate your exponents using the symbol ^. Answer: E = ________ J