This document appears to be a collection of physics questions and solutions. It includes questions about the speed of an object approaching Earth, the spectral shift of light from an object traveling at high speed, the wavelength range and maximum energy of microwaves, the placement of a screen for a slide projector given the focal length and slide position, the resonant frequency of an LC circuit, and which statement contradicts Maxwell's equations. The solution provided calculates the speed of a meteor relative to Earth based on the given speeds of a spaceship and the meteor.

1. a speed of 0.5c relative to Earth An astronaut aboard a soacecraft enroute to Mars wit relative to
Earth? 26. selativeto eor approaching head on at a speed of o.9c. What is t C) 0.4c D) 2.5Sc E)
None of these is correct 2Z The light emitted by an object traveling at high speed toward Earth
wou 8) -0.73c A) be shifted toward the blue end of the spectrum. B) be shifted toward the red
end of the spectrum. C) undergo no spectral shifts. D) arrive with diminished intensity. E) None
of these is correct 28. Microwaves range in wavelength from about 2.0 x 102 cm to about 5.0 cm.
What is the B) 6.2 mev C) 2.5 ev D) 6.2 ev E) 0.62 mev 29. The lens of a slide projector has a
focal length of +12.0 cm. A slide 12.6 cm to the left of the maximum energy in ev that a
microwave may have? A) 0.025 mev lens forms the object for the lens. The screen should be
placed A) 25 cm to the left of the lens. B) 25 cm to the right of the lens. C) 250 cm to the left of
the lens. D) E) 250 cm to the right of the lens. 390 cm to the right of the lens. 30. L -35 mH C 12
uF The approximate resonant frequency of the circuit shown is A) 1.5 kHz B) 0.25 kHz D) E) 25
kHz None of these is correct. C) 2.4 MHz 31 Which of the following statements contradicts one
of Maxwell's equations? A) A changing magnetic field produces an electric field. 8) The net
magnetic flux through a closed surface depends on the current inside. C) A changing electric
field produces a magnetic field. D) The net electric flux through a closed surface depends on the
charge inside. E) None of these statements contradict any of Maxwell's equations.
Solution
26) (c) 0.4c
Let v be the speed of the meteor relative to the Earth.
What the spaceship observes, is the relative speed.
So,
0.5c + v = 0.9c
=> v = 0.4c