If thermal radiation passes through an atmosphere such that its speed is decreased to 2.1 x 10^8 m/s, determine the wavelength bandwidth of the visible portion of the thermal radiation. Assume that the frequency bandwidth remains unchanged from that of radiation passing through a vacuum.
What will be an ideal response?
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Most of the mass of an atom is ____
a. in the electron cloud b. spread evenly through the atom c. made up of electrons d. concentrated in the nucleus e. concentrated in a disk around the nucleus
A heavy stone of mass m is hung from the ceiling by a thin 8.25-g wire that is 65.0 cm long
When you gently pluck the upper end of the wire, a pulse travels down the wire and returns 7.84 ms later, having reflected off the lower end. The speed of sound in the room is 344 m/s, and the stone is heavy enough to prevent the lower end of the wire from moving. If the wire is vibrating in its second overtone, what is the wavelength of the sound it will produce? A) 0.217 m B) 0.433 m C) 0.650 m D) 0.899 m E) 1.35 m
A ball thrown upwards reaches a maximum height and then comes back down to the original level. At the peak of the motion, the velocity is __________ and the acceleration points __________
Fill in the blank(s) with correct word
A circuit contains two inductors of 6.0-mH inductance in series placed in parallel with an inductor of 8.0-mH inductance. After one of the 6.0-mH inductors burns out, the repair person wants to replace all three inductors with one inductor of equivalent inductance. Assuming inductors combine in series and parallel the same way resistors do, what inductance should she use?
a. 3.0 mH b. 3.4 mH c. 4.8 mH d. 11 mH e. 20 mH