Answer:
The correct option is C
Explanation:
From the question we are told that
The wavelength is 
The angle is 
The order of maxima is n = 3
Generally for constructive interference
=> 
=> 
=> 
=> 
Density is a physical property that describes the relationship between mass and volume. Density is the amount of matter in a given space, or volume.
Fréquence of 20,000hz is called ULTRASOUND
Thomson used a beam of negatively charged particles.
Answer:
0.41
Explanation:
given,
mass of the car, m = 2290 Kg
initial speed = 10.5 m/s
mass of another car, M = 2780 Kg
distance moved = 2.80 m
coefficient of friction = ?
conservation of energy
m u = (M + m) V
2290 x 10.5 = (2290 + 2780) V
V = 4.74 m/s
using equation of motion
v² = u² + 2 a s
4.74² = 2 x a x 2.8
a = 4.02 m/s²
now using equation
a = μ g
4.02 = μ x 9.8
μ = 0.41
