Answer:
2.30 eV
Explanation:
Some details of the problem are missing:
"Light of wavelength 540 nm is required to extract electrons from sodium. What is the work function of sodium?"
The equation that describes the photoelectric effect is
where:
is the energy of the incoming photon, with
is Planck constant
is the speed of light
is the work function of the material
K is the maximum kinetic energy of the emitted photoelectrons
The minimum energy needed by the photons to extract the photoelectrons is that for which the kinetic energy is zero, so
K = 0
Therefore we have
In this problem, we know that the wavelength of the incoming light is
Therefore, we can find the work function of sodium:
And converting into electronvolts,
Answer:
Acceleration is zero
Explanation:
if the acceleration is zero, then the velocity-time graph is a horizontal line (i.e., the slope is zero). If the acceleration is positive, then the line is an upward sloping line (i.e., the slope is positive).
Answer:
D) You will feel the same weight as you do on Earth.
Explanation:
According to Einstein's equivalence principle, states that the weak equivalence principle holds and that: The test result of any non-gravitational experiment in a freely falling laboratory is independent of the velocity of the laboratory and its location in spacetime. This simply means gravitational force is proportional to inertial mass, and the proportionality is independent of the kind of matter.
Hence, You will feel the same weight as you do on Earth because you won't feel any change and will have no way to know that you've left Earth.
<span>Spring tides have higher high tides and lower low tides when the moon, sun, and earth are aligned in a row. Why does this occur?
A.gravitational pull is stronger
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