Light waves are transverse waves they do not require material medium to travel. Hence they are called electromagnetic waves. Light waves travel in vacuum with the velocity 3*10^7 m/s.
54) Light travels at the fastest speed in
Answer is:
vaccum
Explanation:
Related General Physics MCQ with Answers
Answer is:
necessary centripetal force may be obtained from the horizontal component of the weight of the train
Explanation:
The reason for this to happen is because of the presence of centrifugal force that tends to push the circularly moving object away from the center. The same thing happens when a train is moving at a fast pace over a curve. On a flat track, the train would experience pushing and that can move the center of gravity away. To counter this, the curves are banked in order to get the trains to slightly tilt towards the interior so that the centrifugal force can be countered.
Answer is:
metals are good conductor of heat
Explanation:
Actually the correct answer would be metals have high thermal conductivity than plastics as soon as you touch the pen your body heat is emitted onto the metal cap faster as you are cold metal cap becomes cooler.
Answer is:
3.3 km, 0.30 km
Explanation:
DISTANCE = SPEED * TIME TAKEN d1=300*5=1500 d2=300*6=1800 maximum distance=d1+d2 =1500+1800 =3300 metres=3.3km minimum distance=d2-d1 =1800-1500 =300 metres=0.3km
Answer is:
inversely proportional to square of
Explanation:
The intensity of light observed from a source of constant intrinsic luminosity falls off as the square of the distance from the object. This is known as the inverse square law for light intensity.