Give examples of four quantities which are scalars
What will be an ideal response?
distance, speed, time, mass
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Which of the following methods has been the LEAST successful in detecting extrasolar planets around other star systems?
A) regular changes in the positions of the parent stars with respect to more distant stars as they move across the sky B) detection of Doppler shifts in the spectra of the parent stars C) detection of brightness changes in a star as a planet passes in front of it D) detection of reflected starlight
A 3.0 cm tall statue is 48. cm in front of a biconvex lens (focal length 20. cm)
(a) Is the image real or virtual? (b) How far is the image from the lens? (c) Is the image upright or inverted? (d) How high is the image?
A light ray enters a glass enclosed fish tank. From air it enters the glass at 20.° with respect to the surface, then emerges into the water. The index for glass is 1.50 and for water 1.33
(a) What is the angle of refraction in the glass? (b) What is the angle of refraction in the water? (c) Is there any incident angle in air for which the ray will not enter the water due to total internal reflection?
A radioactive isotope of atomic number Z emits a beta-minus particle, and then the daughter nucleus emits a gamma ray. What is the atomic number of the resulting nucleus after both processes?
A) Z - 3 B) Z + 1 C) Z - 2 D) Z - 1