Answer:
rock will hit the ground at the same time.
Explanation:
given,
Jan throws rock vertically downward with some initial velocity(v).
Len throw rock at an angle of 30° with initial velocity(2 v) twice than the Jan
to find whose rock will hit the ground first.
it is given that rock is identical
now,
vertical component of velocity of the rock
= v₂ sin θ
= v₂ sin 30°
=
= v
hence the vertical velocity of the Len is same as that of Jan so the rock will hit the ground at the same time.
Answer:
Profound implications. (Image credit: Keystone/Hulton Archive/Getty) ...
Electromagnets. Electrical transmission towers support wires that carry electricity from power plants to homes. ( ...
Global Positioning System. (Image credit: NASA) ...
Gold's yellow color. ...
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Your old TV. ...
Light
Pull into the lot of a place that's 24 hours therefor if a office drives by its just a car
Energy of electron in atom level n =
When n = 4
When n = 5
Energy of photon absorbed = -0.544 - (-0.85) = 0.306 eV = 0.489 * J
We also have energy of photon =
Comparing both
So, Energy of photon = 4069 nm
The correct answer to the question is - A). Light waves can travel in a vacuum and travel at a constant speed even if the light source is moving.
EXPLANATION:
Before going to answer this question, first we have to understand the fundamental postulate of quantum mechanics.
As per the fundamental postulate of quantum mechanics, the speed of light is always constant irrespective of the nature of frame of reference i.e speed of light is same both in inertial and non-inertial frame of reference. It is independent of the velocity of source also.
Again we know that light is an electromagnetic wave. Hence, it won't require any medium for its propagation. It can travel in space or vacuum also.
Hence, the correct option out of four options is that light waves can travel in a vacuum and travel at a constant speed even if the light source is moving.