Answer: The correct answers are (I) and (III).
Explanation:
The expression for the relation between the speed of the wave and the frequency is as follows;
Here, f is the frequency and is the wavelength.
The speed of the wave depends on the medium in which the wave travels.
It depends on the type of wave but it does not depend on the amplitude of the wave.
For example, the speed of the sound wave is more in the solid medium in comparison to the liquid and gaseous medium as the solid medium is more dense. Here, the particles are more closer.
The speed of light is more than the speed of the sound. Light is transverse wave whereas sound wave is longitudinal wave.
Therefore, the factors which influence the speed of a wave are as follows;
the type of wave (II )and (III) the medium in which the wave travels.
Answer:
Explanation:
As we know that position of maximum on the screen in diffraction pattern is given as
here we know that
position of third maximum due to red color light and position of fifth maximum of unknown wavelength are same
so we have
so we have
Answer:
Work done, W = −287500 Joules
Explanation:
It is given that,
Mass of the car, m = 920 kg
The car is travelling at a speed of, u = 90 km/h = 25 m/s
We need to find the amount of work must be done to stop this car. The final velocity of the car, v = 0
Work done is also defined as the change in kinetic energy of an object i.e.
W = −287500 Joules
Negative sign shows the work done is done is opposite direction.