Physics question and answers for July 13, 2023
- Q 1.) A playground merry-go-round with a radius of 1.75 m and arotational inertia of 124.5 kgm2 is stationary. A robotwith a mass of 32.5 kg gets on and walks around...
- Q Briefly discuss:(i) Spencer cavity theory and when application of this theory isessential fordosimetry.(ii) Phoswitch detector, its principle of operation using a diagramand its applicationin PET.(iii) What effect does a magnetic...
- Q A properly insulated, tightly wound, 98 cm solenoid is made fromwire that is 0.49 mm in diameter. When steady current flows throughthe solenoid, a potential difference of 43 V is...
- Q Array of atoms in 1-D with a periodicity as shown below in whichevery atom has a mass m but the bond strength change alternative bythe values k1,k2,find the vibrational frequency...
- Q If a ball falls in vacuum from a certain height describe thetotal energy, the kinetic energy, and the potential energy duringthe fall. Describe the energy values at the initial point...
- Q Write the two laws ofthermodynamics. Write the two laws in terms of the efficiency.For the efficiencyvalues chose from these options: higher or equal to 1 (efficiency ≥1), lower or equal...
- Q 1: A woman backs her van out of her garage witha constant acceleration of 1.1 m/s2. Assumethat her initial motion is in the positive direction.Part (b) If she then brakes...
- Q There are some patients with keratoconus that have corneas thatare abnormally thin and bulge out into a cone shape. Consider apatient whose eye has a moderate case of keratoconus. Therefractive...
- Q Please write a report on the topic of Electromagnetic wavewith Echo device and put it in the file ofword  andNote preferably if it contains pictures and sources, thankyou
- Q Show details and write answers using 2S+1LJ notation, where S,L, J are the total values for each atom:a) Use Hund’s 1st rule to show that Si atom can be described...
- Q Select alltrue statements.The threshold of humanhearing is defined as having an intensity of exactly oneW/m2.Sound is alongitudinal wave in air.Sound waves travelfaster through gases than through solids.The sound of a...
- Q Concepts/Descriptiona. Discuss the difference between internal quantum efficiencyand external quantum efficiency of a LED.b. Describe the operation of a photodiode
- Q 1. The Earth spins one full rotation every 24 hours. You, a madscientist bent on destroying the world, wish to make \"Earth standstill\" - you want to make it stop...
- Q In your own words, explain what conductors andinsulators are, and describe how and why they differ. Then explainwhy it is important to avoid touching live electrical wires.Provide your explanation in...
- Q Is there a simple derivation for the law of reflection using theintegral form of Maxwell's equations?
- Q Concepts/Descriptions:a. List the modes of interaction for photons and electron in asolid.b. Contrast spontaneous emission and spontaneous emission ofphotons
- Q For this problem, assume that high frequency sound waves travelthrough human tissue at 1500 m/s (about the speed of sound inwater).a) Measurements of the blood flow in the ascending aorta...
- Q A thin uniform disk of radius r and mass m is spinning about itscenter at angular speed ω0. The disk is placed flat on a horizontalsurface. The coefficient of kinetic...
- Q Air at 15°C flows at 9 m/s parallel to a thin flat platemeasuring 260 mm × 390 mm. The direction of flow is parallel to the260-mm edges. The surface of...
- Q Thermodynamics: State the three Laws ofThermodynamics and explain their meanings.
- Q Modern versus classical SportWhat role does techonolgy play in modern sport? Givean example of modern sport that relies on technology and speculateon the historical beginnings of that particular sport before...
- Q What are incident neutrons??
- Q Derive the density of states for free electrons as a function ofenergy E in 1) one-dimension, 2) twodimension, and 3)three-dimension (N=total number of electrons, m=electron mass,V=volume of solid) (Hint: First,...
- Q How does Shallow Trench Isolation cause compression in theisland structure silicon?
- Q An electrical machine dissipates 2.5 kW. All cooling of the unittakes place through one exposed surface, measuring 120 mm × 190 mm.All other surfaces of the unit are insulated. 50...
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