The image of an object placed in front

of a concave mirror is always upright.


1.True
2.False


2

Physics & Space Science

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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

Physics & Space Science

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.

Physics & Space Science

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

Physics & Space Science

Radioactivity Basics: The nuclei of He are also known as

A. ? particles. B. ? particles. C. ? rays. D. x-rays. E. positrons.

Physics & Space Science