Answer:
Bar graph
Explanation:
each day collects data so a bar graph would work.
..... It would possibly she eenejjsjejeej 1.4
Answer:
The observer detects light of wavelength is 115 nm.
(b) is correct option
Explanation:
Given that,
Wavelength of source = 500 nm
Velocity = 0.90 c
We need to calculate the wavelength of observer
Using Doppler effect

Where, 


Hence, The observer detects light of wavelength is 115 nm.
That is true imo not false