Absorption of light passing through the glass is a bigger problem for Cassegrain reflectors than achromatic refractors
Indicate whether the statement is true or false
FALSE
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Why do optical astronomers often put their telescopes at the tops of mountains, whereas radio astronomers sometimes put their telescopes in deep valleys?
What will be an ideal response?
In beta decay, it is found that the energy of the emitted electrons varies and is always less than what is calculated on the basis of the parent and daughter nuclei. This is evidence for the existence of another particle called the
A) gluon. B) meson. C) neutrino. D) quark. E) positrons.
What evidence is there that Earth has been struck by large meteorites?
What will be an ideal response?
A car travels in a flat circle of radius R. At a certain instant the velocity of the car is 24 m/s west, and the total acceleration of the car is 2.5 m/s2 53° north of west. Which of the following is correct?
a. R = 0.29 km, and the car's speed is increasing. b. R = 0.23 km, and the car's speed is decreasing. c. R = 0.23 km, and the car's speed is increasing. d. R = 0.29 km, and the car's speed is decreasing. e. R = 0.29 km, and the car's speed is constant.