Answer:
agree with student 2, disagree with student 1
Explanation:
If you want to know if the wavelength of light was shifted you have to know the original wavelengths
Since we know the absorption spectrum for elements like hydrogen, we can look for these absorption lines in the star's spectra and figure out what direction these lines are shifted and tell if the star is moving away or towards us
The color of the star refers to the temperature of the star's surface which is not related to the doppler shift of the star
It would be work I assure you
Answer:
12 km/h
Explanation:
Let v represent Yashvi's speed in km/h.
time = distance/speed
48/v -1 = 48/(v+4) . . . . time is 1 hour less at v+4 km/h
48(v+4) -(v)(v+4) = 48v . . . . . multiply by v(v+4)
48v +192 -v^2 -4v = 48v . . . eliminate parentheses
v^2 +4v -192 = 0 . . . . . . . . . . put in standard form
(v -12)(v +16) = 0 . . . . . . . . . . factor
v = 12
Yashvi's speed is 12 km/hour.
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<em>Check</em>
At 12 kph, it takes 48/12 = 4 hours to ride 48 km. At 12+4 = 16 kph, it takes 48/16 = 3 hours to ride 48 km. That's 1 hour less, as it should be
River shore is located at distance
speed of the woman is given as
now the time taken by the woman to cover the distance is
for the same time interval the dog will run to and fro with speed 4.5 m/s
so the total distance moved by the dog is given by
<em>so the total distance that dog will move is 7200 m or 7.2 km</em>
