When a source of light moves towards the observer with a certain speed, the observer receives________
A. a light of lower frequency
B. a light of higher frequency
C. a light of higher wavelength
D. light of the original frequency
Answer:B
When a source of light moves towards the observer with a certain speed, the observer receives________
A. a light of lower frequency B. a light of higher frequency C. a light of higher wavelength D. light of the original frequency