Suppose the decay constant of radioactive substance A is twice the decay constant of radioactive substance B. If substance B has a half-life of 4 h, what's the half-life of substance A?
1.8 h
2.4 h
3.2 h
3
Physics & Space Science
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Explain how the Doppler Effect has been used to detect invisible planets orbiting other Sun-like stars
What will be an ideal response?
Physics & Space Science
According to Einstein’s theory of special relativity, a stationary observer measures
A. a shorter length of an object than a moving observer measures B. a longer length of an object than a moving observer measures C. the same length of an object than a moving observer measures
Physics & Space Science
A ray of light strikes a thick sheet of glass (n = 1.5) at an angle of 22° with the normal. Find the angle of the ray reflected off the glass surface with respect to the normal
a. 33° b. 50° c. 14° d. 22° e. 15°
Physics & Space Science
What do we mean when we say that electron energy levels in atoms are quantized?
What will be an ideal response?
Physics & Space Science