Lab 11

I Review I Constants I Periodic Table A radio antenna broadcasts a 1.0 MHz radio wave with 20 kW of power. Assume that the radiation is emitted uniformly in all directions. Part A What is the wave's intensity 35 km from the antenna? Express your answer in watts per meter squared.

Plz I need the correct answer of this questions all branch in electronics

3 Traffic Ticket A physicist is arrested for running a red light. In court, he pleads that he approached the intersection at such a speed that the light looked green to him. The judge, having taken a couple physics courses as an undergraduate, changes the charge to speeding and fines the defendant $1 for every mile per hour over the local speed limit of 30 miles per hour. What is the fine? Assume the wavelength of green light is 530 nm and the wavelength of red light is 650 nm.

Laser Safety A 0.95 mW laser emits a narrow beam of light that enters the eye. d=5.0 um a.  How much energy is absorbed by the eye in 0.20 s?  b. The eye focuses this beam to a tiny spot on the retina, perhaps 5.0 μm in diameter. What is the average intensity of light at this spot?

Radio Range A 60-kW radio transmitter on Earth sends its signal to a satellite 100 km away. At what distance in the same direction would the signal have the same maximum field strength if the transmitter’s output power were increased to 90 kW? In three dimensions, a signal spreads over a solid angle as it travels outward from its source.

Revie Part A A sun-like star is barely visible to naked-eye observers on earth when it is a distance of 16 7.0 light years, or 6.6 x 104º m, away. The sun emits a power of 3.8 x 10 W. 26 Using this information, at what distance would a candle that emits a power of 0.38 W just be visible? Express your answer with the appropriate units. HA Ad = Value Units %3D Submit Request Answer

Physics Time delay to Jupiter A radio pulse is sent from the Earth, reflected off a satellite of Jupiter (the satellite is a point), and received on Earth. Jupiter is a distance r2 from the Sun, the Earth is a distance r1. Assume that Jupiter is on the other side of the Sun relative to the Earth. Let r0 be the distance of closest approach of the radio pulse to the Sun. Calculate the gravitational delay in the round-trip time of the radio pulse as a function of r0, to lowest order in G.

Notes Evaluate Feedback A mass spectrometer, sketched below, is a device used to separate different ions. Such ions with a well-defined velocity vo enter through a slit into a region of uniform magnetic field B, where they follow a semicircular path until they strike the detector slit above the entry slit. The distance between the entry and the detector slit is d = 1.80 m. d detector sit XXXXX xx X Chlorine ions of mass 35 amu (1 amu equals 1.66x10-27 kg), carrying a charge of +1e enter the spectrometer with initial speed of vo = 3.90x10³ m/s. What value of B is required for these ions to hit the detector? Submit Answer Tries 0/12. Equally charged chlorine ions of mass 37 amu now enter the spectrometer. How close to the detector slit will they impact? Submit Anawer Tries 0/12

1.Who demonstrated the existence of E&M(electromagnetic) radiations (waves made of energy that traveled through space rather than connected through a wire)? A.Dr. Daniel Jackson & Jack O'Neill B.Heinrich Hertz & James Maxwell C.James Maxwell & Michael Faraday D.Benjamin Franklin & Thomas Edison E.Heinrich Hertz & James Morse   2.What do we call a form of electromagnetic radiation that is very short where its wavelength is the same size as the diameter of a water molecule?   A.X-Ray B.Microwave C.Gamma Rays D.Radio Waves E.Infrared   3.Who is the first person to die in the electric chair? A.Albert Fish B.Ted Bundy C.John Spenkelink D.William Kemmler E.Joseph Syzmankiewicz F.Robert Sullivan

The electromagnetic waves that carry FM radio range in frequency from 87.9 MHz to 107.9 MHz. What is the range of wavelengths of these radio waves?A. 500–750 nm        B. 0.87–91.08 mC. 2.78–3.41 m        D. 278–341 mE. 234–410 km

3. Given BF is F(x,y,z) = ĩỹ z +x y z + šỹz +xỹ7. %3D (i) Simplify the BF by k-map (ii) Draw a circuit(using inverter, OR, AND gates) and make a truth table of simplified form of BF.

QUESTIONS QUESTION 4 Of a photon that has a wavelength of 785 nm is. 019 Consider two electromagnetic waves, E1 and E2: E1 = Egel(kx-wt+); E2 = Egel(kx-wt) ; the aboye Non If the waves are traveling in the same space at the same time, which of the following is true? The waves are 90 degrees out of phase. The waves will interfere destructively. The waves are propagating along the y-axis. The electric field is oriented along the x-axis.

Can You solve this please?

Question 10 Police radar speed guns basically work by reflecting electromagnetic waves off the car's surface. Suppose you want to drive real fast on the motorway and somehow you have tracked exactly the frequency of police speed radar. The frequency of the police speed radar is f 1238 Hz. Find its wavelength. Hint c = 3 x 10% No need to include the unit. Write your answer in whole numbers. Round your answer to 0 decimal places.

Absorption of Light A spectrophotometer measures the con- centration of a sample dissolved in water by shining a light through it and recording the amount of light that emerges. In other words, if we know the amount of light that is absorbed, we can calculate the concentration of the sample. For a certain substance the concentration (in moles per liter, mol/L) is found by using the formula C = -2500 In where I, is the intensity of the incident light and I is the intensity of light that emerges. Find the concentration of the substance if the intensity I is 70% of Io- 10

A Moving to the next question prevents changes to this answer. Question 1 of 6 Question 1 0.5 points Save Answer A police radar unit is operating on a frequency of 9.527 GHz. What is the wavelength of the radiation being employed? O a. 314.7 nm O b.314.7 cm Oc. 314.7 m Od.3.147 cm A Moving to the next question prevents changes to this answer. Question 1 of 6

Lasers that we use in our laboratory emit large amounts of intensity suppose you are operating the laser and note that the average intensity of the light it 8.97x10^9 W/m^2 find the rms value of the electric and magnetic field emitted by the laser

In a dentist's office an X-ray of a tooth is taken using X-rays that have a frequency of 6.28 × 1018 Hz. What is the wavelength in vacuum of these X-rays? Number i Units

Question 5 An example of Electromagnetic wave which is invisible to human eye is answered Marked out of O a. all electromagnetic waves P Fag question O b. all electromagnetic waves except gamma rays O c all electromagnetic waves except light waves O d. all electromagnetic waves except Radio waves Quertion 6 If the temperature of the metal surface is (7.6) K then calculate its value in Fahrenheit Not yet O a. -286.556 Marked out of O b. 259.444 P Flag question OC.473.080 O d.-445.720

Q4) Ali is trying to make his mind between two different types of light bulbs to be installed in his new villa based on their efficacy, and how much it would cost to run each light. Option 1 is a standard CFL light that consumes 95 watts and has an illumination rating of 1800 lumens and costs $0.55 and has a service life of 650 hours. Option 2 is LED light that consumes 35 watts and has an illumination rating of 2300 lumens and costs $1.85 and has a service life of 900 hours. Calculate efficacy and how much it would cost to run each light for 13 hours per day for 60 days as the electric company charges 15 cents per kWh and state which option should Ali go with? (1 kW = 1000 W) Light Produced (lumens) Efficacy = Energy Consumed by the Lamp (watts)

2) Some hospital operating rooms have UV light bulbs that are switched on when the room is vacant or not in use.        a. What is the purpose of these lights?        b. Why are the UV lights switched on when the room is vacant or not in use?