The image of an object placed in front
of a concave mirror is always upright.
1.True
2.False
2
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Radioactivity Basics: The nuclei of 
He are also known as
A. ? particles. B. ? particles. C. ? rays. D. x-rays. E. positrons.
How have astronomers discovered planets orbiting a star beyond the Sun?
A. They can see the planet brighten as it passes in front of its parent star. B. They have bounced radar off them. C. They can be detected by the slight gravitational tug that they exert on their parent stars. D. So far, no planets have been discovered around any other stars.
A photon whose wavelength is = 5.0 × 10^-11 m is scattered straight backward. What is the wavelength of the scattered wave?
a. 5.0 × 10^-11 m b. 4.5 × 10^-11 m c. 5.5 × 10^-11 m d. 6.0 × 10^-11 m e. 6.5 × 10^-11 m
An electron and positron, each having kinetic energy 10 MeV, annihilate and produce two photons. What wavelength is each photon?
A. 0.124 pm B. 0.118 pm C. 0.248 pm D. 0.062 pm E. need more information