Three discrete spectral lines occur at angles of 10.3°, 13.6°, and 15.4° in the first-order spectrum of a grating spectrometer. (Assume that the light is incident normally on the gratings.) (a) If the grating has 3 680 slits/cm, what are the wavelengths of the light? (Enter your answers from smallest to largest.) nm nm nm (b) At what angles are these lines found in the second-order spectrum? (Enter your answers from smallest to largest.)

You measure the distance between the finges of a diffraction pattern as follows: Distance (mm): 3.01, 3.27, 3.28 You measure the distance eight additional times to obtain the following ten values: Distance (mm): 3.01, 3.27, 3.28, 3.31, 3.16, 3.17, 3.15, 3.25, 3.18, 1.46 What values for the distance and uncertainty would you report using the first three measurements and the entire set of ten measurements? Group of answer choices First three: (3.22 ± 0.03) mm, All ten: (3.22 ± 0.02) mm First three: (3.19 ± 0.09) mm, All ten: (3.0 ± 0.2) mm First three: (3.186667 ± 0.07216237) mm, All ten: (3.201000 ± 0.02613236) mm First three: (3.216667 ± 0.02880329) mm, All ten: (3.216000 ± 0.02379916) mm First three: (3.240000 ± 0.04082483) mm, All ten: (3.217000 ± 0.02702036) mm First three: (3.24 ± 0.04) mm, All ten: (3.22 ± 0.03) mm

You have been taken to the emergency room. To get a constant update on your vital signs, equipment is attached to you, including a pulse oximeter. The pulse oximeter shines two LEDs on your finger to test how much oxygen is in your blood. One LED transmits in infrared (921 nm) and one transmits in visible red (632 nm). What are the frequencies of these LEDs? Red: (Hz) Infared: (Hz)

Question A2 Red light of vacuum wavelength 650 nm is travelling in a non-magnetic dielectric glass of refrac- tive index ng = 1.60. Calculate the impedance of the glass, the wavelength of light in the glass, and the critical angle 0c for total internal reflection at a glass-air interface. Question A3 Light is incident from air onto a horizontal surface of water of refractive index nw = 1.33. Calculate the Brewster angle at which the reflectance for the TM polarisation is zero. Also, cal- culate the power reflection coefficient RTE for TE-polarised light incident at this Brewster angle.

please answer v

Prior to the switch to digital television broadcasting, and to the popularity of cable television, many homes had outdoor TV antennas. TV-reception antennas for VHF (channels 2 through 13) were constructed with cross wires supported at their centers, as shown in the figure below. The ideal length for the cross wires is one-half the wavelength to be received, with the more expensive antennas having one for each channel. Suppose you measure the lengths of the wires for channels 12 and 6 and find them to be 0.208 m and 0.958 m long, respectively. What is the frequency for channel 12?Hz What is the frequency for channel 6?Hz

Unpolarized light of intensity 850 W/m² is incident on two ideal polarizing sheets that are placed with their transmission axes perpendicular to each other. An additional polarizing sheet is then placed between the two, with its transmission axis oriented at 30° to that of the first. 1) What is the intensity of the light passing through the stack of polarizing sheets? (Express your answer to two significant figures.) Submit W/m² 2) What orientation of the middle sheet enables the three-sheet combination to transmit the greatest amount of light? Submit

Problem 19:  Sodium vapor light (average wavelength 598 nm) falls on a single slit of width 7.75 μm.Randomized Variablesλ = 598 nmw = 7.75 μm     At what angle θ, in degrees, does it produces its second minimum?Numeric   : A numeric value is expected and not an expression.θ = __________________________________________

the apparatus shown x xx X x x x x FB -F in x x xx x x x x * X x x X x xx * X X X xx X * Slit Source is called Select one: a. none of the above b. spectrometer C. mass selector d. charge selector e. velocity selector x x X X A 十 其

A grating with 250 grooves/mm is used with an incandescent light source. Assume the visible spectrum to range inwavelength from 400 nm to 700 nm. In how many orders can one see (a) the entire visible spectrum and (b) theshort-wavelength region of the visible spectrum?