Equal to 50
law of reflection: angle of incidence equals angle of reflection
Solar cells are used to trap sunlight energy (light energy) and convert it to electric energy for domestic and other purposes.
Answer:
20 m/s
Explanation:
The speed of a wave is given by:

where
is the wavelength
f is the frequency
v is the speed
For the wave in this problem,
f = 10 Hz is the frequency
is the wavelength
So the speed is

Answer:
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