Hydrogen emits light at certain discrete frequencies. One particular emission has a frequency of 4.57 × 1015 s-1, as measured in the frame of reference of the hydrogen atom
Light from this emission is observed coming from a star that is moving away from Earth at 0.900c. What is the observed frequency? Note that, in addition to time dilation, one must take into account that successive wavefronts have to travel longer distances because the star is moving away (Doppler Effect). A) 1.99 × 1015 s-1
B) 7.62 × 1015 s-1
C) 1.99 × 1016 s-1
D) 1.05 × 1015 s-1
E) 0.90 × 1015 s-1
D
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A floating leaf oscillates up and down two complete cycles in one second as a 10-meter long water wave passes by. What is the wave's speed?
A) 2 m/s B) 10 m/s C) 20 m/s D) 40 m/s E) more than 40 m/s
If a galaxy is moving away from us the wavelength of the light it emits will be
A. increased. B. blueshifted. C. unaffected. D. distorted. E. decreased.
According to heat maps, a website's visitors typically follow a(n) ______ pattern.
A. F B. T C. L D. E
Derive the stability criterion for an inside-corner boundary control volume for two- dimensional steady conduction when a convection boundary condition exists.
GIVEN Two-dimensional steady conduction at an inside corner with a convection boundary condition FIND (a) The stability criterion