Answer:
A).Increase
Explanation:
Refraction is the change in direction of waves that occurs when waves travel from one medium to another. Refraction is always accompanied by a wavelength and speed change. Diffraction is the bending of waves around obstacles and openings. The amount of diffraction increases with increasing wavelength.
Frequency doesn't change because it depends on travelling of waves across the interface. But speed and wavelength change as the material on the other side may be different, so now it might have a longer/shorter size of wave and so the number of waves per unit time changes.
Swimming, because during swimming we use more muscles than when we sprint, stretch, etc..
Answer:
Part a)
Part B)
Explanation:
Part a)
Average power is rate of energy consumption
So it is given as
Part b)
If the efficiency is given as
%
so we know that 20% of total energy consumed is converted into output work
So total power consumed here will be given as
Energy consumed by him
now we know that 1 g fat will release 9 Calories energy
So we have
so to consume 1000 g of fat we need to release total energy
so total number of times
L = illuminance
A = surface
i = intensity
L = i / A ==: i = L * A
i = 6 lux * 4 m^2 = 24 lumen
