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- Which type of electromagnetic radiation has the longest wavelength? X-rays, Ultrasound, Microwaves, Infrared, Yellow light.
- In the twin paradox, which statement is true? a. As the twin traveling to the nearest star gets further away, it takes longer to send messages between Earth and the ship. This makes it appear that the traveling twin is younger, although they are really the same age when the trip is over. b. While the twin is moving, they age more slowly than the twin on Earth. However, the rapid deceleration upon arriving back on Earth causes the traveling twin to rapidly age. This occurs because the twins are now in the same inertial frame, and thus must be the same age. c. The paradox is that both twins can claim to be measuring the proper time, and thus the younger twin. However, the paradox gets resolved after a more careful analysis, revealing that the traveling twin is the youngest. d. All of the above are true. None of the above is true.
- An object placed at a distance of s
- Which of the following will there exist a critical angle for total internal reflection? a. Air into water. b. Glass into water. c. Water into glass. d. All of the above.
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Updated on: Nov 4, 2024
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A gaseous mixture enclosed in a vessel of volume V consists of one gram mole of gas A with γ=Cp/CV=5/3 and another gas B with γ=7/5 at a certain temperature T. The gram molecular weights of the gases A and B are 4 and 32 respectively. The gases A and B do not react with each other and are assumed to be ideal. The gaseous mixture follows the equation pV19/13= Constant, in adiabatic process.(a) Find the number of gram moles of the gas B in the gaseous mixture.(b) Compute the speed of sound in the gaseous mixture at 300K.(c) If T is raised by 1K from 300K, find the percentage change in the speed of sound in the gaseous mixture.(d) The mixture is compressed adiabatically to 1/5 of its initial volume V. Find the change in its adiabatic compressibility in terms of the given quantities.
In a soccer practice session, the football is kept at the centre of the field 40 yards from the 10 ft high goalposts. A goal is attempted by kicking the football at a speed of 64 ft/s at an angle of 45° to the horizontal. Will the ball reach the goalpost?
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Determine the equivalent resistance of the following arrangements:1. An infinite ladder of 1Ω resistors: Hint: the remaining array is the same if you remove the first 3 resistors on the left.UUUI2. A cube has 19 resistors on each edge. Find the resistance measured across one edge, across a face diagonal, and across a body diagonal.3. There are 4 other Platonic Solids: Tetrahedron, Octahedron, Dodecahedron, and Icosahedron.TetrahedronOctahedronCubeIcosahedronDodecahedronIf each edge is a 1Ω resistor, calculate the resistance across one edge and across a diameter or body diagonal, indicated by the blue dots.
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| Question Text | A converging lens is concave, while a converging mirror is convex. Either convex or concave; it just depends on where the object is placed. |
| Updated On | Nov 4, 2024 |
| Topic | All topics |
| Subject | Physics |
| Class | Class 11 |
