State whether the light from an object moving towards us will be red shifted or blue shifted and explain why.
1 answer:
Answer:
The light from an object which is coming towards us will be blue shifted.
Explanation:
According to the Doppler effect the movement of the source towards the observer will lead to increase in thew apparent frequency by the Doppler formula,
Now when the there is increase in frequency then the wavelength is decrease because it is inversely related to frequency.
The wavelength of blue shift is lies in the range of 450-490 nm and the wavelength of red shift lies in the region of 635-700 nm.
Therefore, decrease in the wavelength will lead to blue shift.
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Answer:
T = 0.017s
Explanation:
period is the time it takes a particle to make one oscillation
An electric current is periodic in nature
The current reaches 3.8A ten times.
So there must have been 10 cycles (10 periods) in 0.17s. let 'T' be the period:
t is the total time interval
n is the number of oscillations
10T = 0.17
T = 0.17/10 = 0.017s
Answer:
a) 23 m/s
Explanation:
- Assuming no external forces acting during the collision, total momentum must be conserved, as follows:
- The initial momentum p₀, can be written as follows:
- The final momentum pf, can be written as follows:
- Since (2) and (3) are equal each other, we can solve for the only unknown that remains, v₂₀, as follows:
- This means that the 2.0-kg object was moving at 23 m/s in a direction opposite to the 6.0-kg object, so its initial speed, before the collision, was 23.0 m/s.