Answer:
20 m/s
Explanation:
Distance covered by man =500m
Time taken by man=25 seconds
Speed of man = distance/time
= 500/25
=20 m/s
Answer:B
Explanation:
Magnetic field lines form close loops and never intercept
Low velocity im pretty sure
Answer:
λ = 5.75 10⁻⁷ mm
Explanation:
This is a slit interference exercise, we analyze each wavelength separately
λ = 657 nm indicate that the third dark pattern
a sin θ = (m + ½) lam
a sin θ = (3 + ½) 657 10⁻⁹
a sin θ = 2299.5 10⁻⁹ nm
for the other wavelength in the same place we have m = 4 bright
a sin θ = m lam
we substitute
2299.5 10⁻⁹ = 4 λ
λ =
λ = 5.75 10⁻⁷ mm
C i think. if i’m wrong i’m sorry