Answer: Marie Curie's work with Becquerel made her more curious and prompted her to research and experiment with radioactivity.
Explanation:
Henri Becquerel was a French physicist who in 1896 discovered a new property of matter (which was later called <u>radioactivity</u>). This was accidentally observed when Becquerel found out that uranium salt was spontaneously emitting some kind of rays that went through different substances and were able to veil even a photographic film.
Then Marie Curie and her husband Pierre Curie carried out more experiments to study, in a <u>quantitative way</u>, the radiation emitted by the salts Becquerel studied <u>cualitatively,</u> and other salts that contained uranium. During this process they found other radioactive substances, such as: thorium, polonium and radium.
For that reason, the three of them were awarded the Nobel Prize in Physics in 1903 for their discovery of radioactivity.
Answer:
the charge carriers have an energy 2.8 10⁻¹⁹ J
Explanation:
The energy in a diode is conserved so the energy supplied must be equal to the energy emitted in the form of photons.
The energy of a photon is given by the Planck expression
E = h f
the speed of light, wavelength and frequency are related
c = λ f
we substitute
E =
a red photon has a wavelength of lam = 700 nm = 700 10⁻⁹ m
we calculate the energy
E = 6.626 10⁻³⁴ 3 10⁸/700 10⁻⁹
E = 2.8397 10⁻¹⁹J
therefore the charge carriers have an energy 2.8 10⁻¹⁹ J,
Answer:
sorry I don't really know :P
Explanation:
Answer:
Explanation:
The work increased the potential energy
W = PE = mgh = 40(9.8)(15) = 5880 J(oules)
Answer:
7.08 m
Explanation:
(If we ignore the refraction of light)
There will form two triangles one at the top of pool (torch, edge of pool and point of incidence at top of pool) and one at the bottom of pool (torch, edge of pool and point of incidence at bottom of pool) .
first triangle at the top of pool (torch, edge of pool and point of incidence at top of pool)
First we need to find the angle of incidence:
Height = perpendicular = 1.3 m
Point of incidence = base= 2.5 m
now
tan∅= perpendicular / base
∅= tan⁻¹ (perpendicular / base)
∅=tan⁻¹ (1.3/2.5)
∅= 27.5°
Now 2nd triangle at the bottom of pool (torch, edge of pool and point of incidence at bottom of pool)
Height = perpendicular = 1.3 m + 2.1 m= 3.4 m (torch height + depth of pool)
∅= 27.5°
Spot of light hit bottom of pool= base=?
tan∅ = perpendicular / base
base = perpendicular / tan∅
base = 3.4/tan(27.5°)
base= 7.08 m
Spot of light hit bottom of pool= base= 7.08 m