Answer:
Explanation:
Lightning is seen before the thunder is heard because , velocity of light exceeds velocity of sound. We also know that velocity , wavelength and frequency are related as follows
velocity = frequency x wavelength
velocity of light > velocity of sound
frequency of light x wavelength of light > frequency of sound x wavelength of sound
But given wavelength of light = wavelength of sound
Putting this relation in the equation above
frequency of light x wavelength of light > frequency of sound x wavelength of light
cancelling out equal terms on both sides
frequency of light > frequency of sound
frequency of light will be greater than frequency of sound.
Answer:
White light can be separated into different colors using a special lens called a prism. As visible light passes from air into the glass, the change in medium causes a change in direction and speed. Refraction causing the separation of white light into its various color wavelengths is called dispersion.
hope this helps
Answer:
Frequency,
Explanation:
Given that,
Energy of a gamma rays,
Since,
The energy of a wave is given by :
is the frequency of such a photon
So, the frequency of such a photon is . Hence, this is the required solution.
Answer:
Explanation:
d = v * t, where d is the distance and v is the velocity, t is the time
cheetah
v = 95.4 km/h
gazelle
v= 74.4 km/h
d1 = 83m = 0.083 km
when the cheetah catches the gazelle the distances will be equal
95.4t= 74.4t+0.083
t= 0.00395 h* (3600s/1h) = 14.22 s