A system consists of two photons moving in opposite directions. One photon has energy E and the other has energy 4E. The total system’s mass M is
A. Zero, of course.
B. 3E.
C. 4E.
D. 5E.
E. Something else (specify).
C. 4E.
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The Doppler formula states that the ratio of the velocity of a source to the speed of light is equal to the ratio of the change in wavelength caused by the Doppler shift to the source wavelength, or A spacecraft has yellow headlights which radiate 600nm photons, and is travelling toward a stationary observer. If the spacecraft is travelling at a velocity of 1% of the speed of light (0.01c), what
will be the amount of the shift in wavelength observed (in nanometers)? What will be an ideal response?
Which of the following claims can be tested by scientific means?
a. the final thought of Abraham Lincoln were about the fate of his country b. God exists c. blue is the best color for walls d. people born when the sun is in constellation of Leo are more financially successful than other people
If M = 1.1 kg, what is the tension in string 1?
a.
54 N
b.
47 N
c.
40 N
d.
62 N
e.
57 N
Define and differentiate between user-based and user-controlled website navigation.
What will be an ideal response?