A herdsman yelling out to fellow herdsman heard his voice...
A herdsman yelling out to fellow herdsman heard his voice reflected by cliff 4s later. What is the velocity of sound in air if the cliff is 680m away?
170ms-1
136ms-1
340ms-1
680ms-1
510ms-1
Correct answer is C
Velocity = \(\frac{\text{distance}}{\text{time}}\)
echo time = halt total time
= \(\frac{1}{2}\) x 4 = 25
velocity = \(\frac{680}{2}\)
= 340ms-1
Given three capacitors 0.3μF, 0.5μF and 0.2μF, the joint capacitance when arranged to give minimu...
An insulated rod when rubbed with a material acquires ...
Which of the following remains unchanged as light travels from one medium to the other? i. speed....
The lower fixed part of a faulty thermometer reads 2°C while the upper fixed point is 100°C....