Research history on properties of light

Mercury emits a number of discrete wavelengths of visible light when an electric current passes through it. One of these wavelengths has an energy of 4.45 x 10⁻¹⁹ J. Determine its WAVELENGTH (in m) to the PROPER SIGNIFICANT FIGURES. INCLUDE UNITS. When answering, write your answer in scientific notation as y.yy x 10^yy (ex. 6.02 x 10^23).

The element titanium is now being used as a structuralmaterial for bone and joint replacement (shoulders, knees).Predict properties that you would expect for such applications;utilize the Internet to look up the properties of titanium andevaluate your answer.

- the accepted density of water at room temperature is approximately 1.0 gram/mL. a student conducted an experiment where water was pipetted into a graduated cylinder and then weighed on a scale. the student then calculated the density of water and based on the calculations the density was 1.15g/mL calculate the percent error based on this  1% 0% -13% 100% 15% -true or false. electromagnetic energy consists of packets of energy called electrons that travel in waves.    -hydrogen peroxide was added to a piece of potatoes contain the enzyme, catalyze, hydrogen peroxide was added to the potatoes and bubbles appeared to the presence of oxygen gas, if the hydrogen peroxide was removed and re-added to the potatoes, would bubbling occur again? explain why or why not.

9 of 99 of 9 Questions                                                                                                                                                                                   A wave of blue light has a frequency of 7.65x1014 s-1.  What is the energy of each light wave? Use h = 6.626x10-34 J•s.  Express your answer to three significant figures and in proper scientific notation.

Mercury emits a number of discrete wavelengths of visible light when an electric current passes through it. One of these wavelengths has an energy of 4.45 x 10⁻¹⁹ J. Determine its FREQUENCY (in Hz) to the PROPER SIGNIFICANT FIGURES. INCLUDE UNITS. When answering, write your answer in scientific notation as y.yy x 10^yy (ex. 6.02 x 10^23).

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A 100-watt lightbulb radiates energy at a rate of 100 J/s. (The watt, a unit of power, or energy over time, is defined as 1 J/s.) If all of the light emitted has a wavelength of 515nm, how many photons are emitted per second? (Assume three significant figures in this calculation.) Express your answer using three significant figures.

The correct arrangement of figure I is:     light source → photomultiplier tube → sample → monochromator     light source → sample → monochromator → photomultiplier tube     light source → monochromator → sample → photomultiplier tube     light source → sample → photomultiplier tube → monochromator

I need help with my reasoning for my claim and evidence which I have already done. I need help coming up with a thorough reasoning from what I wrote and the article attached.

An electron with a mass of 9.1×10−28g is traveling at 1.8×107m/s in an electron microscope. Calculate the kinetic energy of electron in units of joules, and report your answer in scientific notation.

Archeologists discover a gold crown in an ancient tomb. When they place the crown in a tub of water it displaces 941.2 mL of water. The density of gold is 19.3 g/mL.Gold is worth $57,056.24 per kg (or was on the day this question was written). Without taking into consideration any historical value for the crown, what is the crown worth?

In the table below, there are descriptions of an experiment on samples of three different chemical elements. Decide whether the element is a metal or nonmetal, if you can. If there is not enough information to decide, choose can't decide in the third column. element description metal or nonmetal? ? Element 1 is a moderately soft silvery-gray solid. A 5 cm x 5 cm square of it, only 1 mm thick, is twisted using two pairs of pliers. The sheet breaks in the middle. The freshly broken edges are lighter colored than the surface. metal 1 nonmetal (can't decide) Element 2 is a shiny silvery-gray solid. A 10. g cube of it is set on a hot plate. After 10 minutes, the temperature of the top of the cube has risen by less than 1 °C. metal 2 nonmetal (can't decide) Element 3 is a hard silvery-gray solid. Wires are fastened to each side of a 2 cm slab of it, and an ordinary household 9 V battery is hooked up so that it can feed electricity through the slab to an LED. The LED glows brightly. metal…

What is the energy in Joules of one mole of photons of visible light having a wavelength of 1.73 × 10² nm? Do not report units in your answer. Do not use scientific notation. Report your answer as a whole number (no decimal places). T

X-rays have a wavelength small enough to image individual atoms, but are challenging to detect because of their typical frequency. Suppose an X-ray camera uses X-rays with a wavelength of 5.67 nm . Calculate the frequency of the X-rays. Round your answer to 3  significant digits.

Humans have three types of cone cells in their eyes, which are responsible for color vision. Each type absorbs a certain part of the visible spectrum. Suppose a particular cone cell absorbs light with a wavelength of 543. nm . Calculate the frequency of this light. Be sure your answer has the correct number of significant digits.

A laser is emitting photons with a wavelength of 736.4 nm. What is the energy for 1 mole of these photons in kJ/mol? For Planck's constant, use a value of 6.626x10-34 J s. Note: Do not use scientific notation or units in your response. Sig figs will not be graded in this question, enter your response to four decimal places. Carmen may add or remove digits from your response, your submission will still be graded correctly if this happens. 249

What is the energy in Joules of one mole of photons of visible light having a wavelength of 6.31 x 10² nm? Do not report units in your answer. Do not use scientific notation, Use 1 decimal place in your answer.

The electron microscope has been widely used to obtain highly magnified images of biological and other types of materials. When an electron is accelerated through a particular potential field, it attains a speed of 3.80  106 m/s. The mass of the electron is 9.11 x 10-31 kg. Planck's constant has the value h = 6.63 x 10-34 J-s. What is the characteristic wavelength of this electron?Wavelength =  mIs the wavelength comparable to the size of atoms? No, since atomic radii are on the order of 10-50. No, since atomic radii are on the order of 1-5. Yes, since atomic radii are on the order of 1-5 .

The radius of a tantalum atom is 142 pm. How many tantalum atoms would have to be laid side by side to span a distance of 2.85 mm?

The subatomic particle known as the proton has a mass of 1.67x10-24 g and a diameter of 1.00x10-13 cm. Calculate the density (in g/cm3) of an atom containing a single proton assuming a perfect spherical shape using the equation v = 4 3 π r 3

What is the wavelength, in nanometers, of light with an energy content of 2.89 x 102 kJ mol-1? Hint: The unit mol1 should be interpreted as "per mole of photons". Enter your answer with three significant figures. Enter scientific notation as 1.23E4. Énter only numbers in your answer. (Do dot include units.) Number nm Ouestic

Explain in 5 to 6 sentences how Hans Christian Oersted explained that magnetic properties of materials originate from the subatomic level.

Steve Rogers was transformed into Captain America through application of fictional vita-rays. If photons of these rays each had an energy of 3.12 x 10–14 J, what is the wavelength of this light, in meters? Show all work, including units, and give your answer to three significant figures.

One of the big problems in chemistry is our dependence upon our five senses (macroscopic observations) to infer what occurs on the atomic and molecular level (microscopic behavior of matter).  Give two examples of observations we can make on the macroscopic level that prove to us that atoms and molecules are in motion.