PET, the diagnostic method, stands for

A. patterned electron technique.
B. positron emission tomography.
C. proton-electron transmission.
D. penetrating emission technique.
E. None of these choice are correct.

B. positron emission tomography.

Physics & Space Science

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From shortest to longest wavelength, which of the following correctly orders the different categories of electromagnetic radiation?

A) infrared, visible light, ultraviolet, X-rays, gamma rays, radio
B) radio, infrared, visible light, ultraviolet, X-rays, gamma rays
C) visible light, infrared, X-rays, ultraviolet, gamma rays, radio
D) gamma rays, X-rays, ultraviolet, visible light, infrared, radio
E) gamma rays, X-rays, visible light, ultraviolet, infrared, radio

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How does dark energy affect the expansion of the Universe?

What will be an ideal response?

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The addition of salt to water affects its

A) crystal composition. B) freezing point. C) viscosity. D) liquidity. E) none of the above

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When light goes from one medium to another medium with a different index of refraction, which of the following do (does) NOT change?

A. the speed B. the wavelength C. the frequency D. the speed and the wavelength E. the frequency and the wavelength

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