Answer:
Explanation:
Given
Initially Reading on the odometer is
Final reading on the odometer is
Time taken is
average velocity
Thus the average velocity of mail truck is
show your working out.
Light takes 162.1 seconds to travel from Venus to earth.
Explanation:
Speed of light=3 x 10⁸ m/s
distance between Venus and earth =30,220,000 miles=48634375680 m
Now the distance is given by d= v t
d= distance
v= velocity
t= time
48634375680= 3 x 10⁸ t
t=162.1 s
B.mechanical waves
C.electromagnetic waves
D.gamma rays
Answer: The correct option is B.
Explanation:
Acoustic deals with the study of mechanical waves and the mediums through which they travel. It includes sound, infra sound, ultrasound and vibrations.
The mechanical wave is a wave which can travel through a material medium. It can travel through solid, liquid and gases. Sound is the mechanical vibrations of the particles of a gaseous medium.
Therefore, acoustic involves the study of mechanical waves and the mediums through which they travel.