Answer:
energy = 391.902 kJ /mol
Explanation:
given data
wavelength = 305 nm = 305 ×
m
to find out
average energy
solution
we know speed of light is 3 ×
m/s
so we find frequency here first by speed of light formyla
speed = wavelength × frequency
3 × = 305 × × frequency
frequency = 9.8360 ×
so energy is
energy = hf
here h = 6.62 ×
J-s
so
energy = 6.62 × × 9.8360 ×
energy = 6.51 ×
J
so
energy = 6.51 × × 
kJ/mol
energy = 391.902 kJ /mol
Things are rubbed against each other
Answer:
c. Sound travels slower than light.
Explanation:
We see any thing because of the light emitted or reflected by it. Whereas the sound is carried by the sound waves. The speed of light is more than the speed of sound. This is the reason the family saw the fireworks first and then heard the sound.
The same can be experienced during the sighting of a Jet plane or a rocket where, we see them way before we can hear the roaring sound of its engines.
Answer:
speed
Explanation:
When a body is in uniform circular motion, its speed remains constant but its velocity, angular acceleration, angular velocity changes due to change in its direction.
Answer:
The value is 
Explanation:
From the question we are told that
The time taken as seen by aliens 
The time taken as seen by attendant 
Generally from the dilation of time equation we have that
Here c is the speed of light
v is the speed of the alien ship
=> 
=> ![1 - \frac{v^2}{c^2} = [\frac{T_1}{T}] ^2](https://tex.z-dn.net/?f=1%20-%20%5Cfrac%7Bv%5E2%7D%7Bc%5E2%7D%20%20%3D%20%20%5B%5Cfrac%7BT_1%7D%7BT%7D%5D%20%5E2)
=> ![1 - \frac{v^2}{c^2} = [\frac{4.1}{8}]^2](https://tex.z-dn.net/?f=1%20-%20%5Cfrac%7Bv%5E2%7D%7Bc%5E2%7D%20%20%3D%20%20%5B%5Cfrac%7B4.1%7D%7B8%7D%5D%5E2)
=>
