Answer:
False
Explanation:
This statement is negates the photoelectric effect.
When an electron absorbs energy it jumps from a lower shell to a higher shell. When the electron releases energy it jumps from a higher shell to a lower shell.
The Kinetic energy of an ejected electron is
Where,
h = Planck's Constant
f = Frequency of incident photon
= Work function
So, this statement is false.
Answer:
a) Qh= 6750 kJ
b) e = 0.296
c) = 390.625° C
Explanation:
Given:
Work done, W = 2000 kJ
Heat flow, Q = 4750 kJ
Temperature at which heat flows out, = 275° C
a) Now, the heat flow through the engine (Qh)
Qh = W + Q
or
Qh = 2000 + 4750
or
Qh= 6750 kJ
b) The efficiency (e) is given as:
on substituting the values, we get
or
e = 0.296
c)
where,
is the temperature at which heat flow
on substituting the values, we get
or
= 390.625° C
for any ray on the mirror, incident angle - reflected angle.
angles wrt a normal to mirror
<u>The statements correctly describe this liquid:</u>
- The liquid contains only one element.
- The liquid is a pure substance.
<u>Explanation:</u>
A chemical component is a substance that contains just one sort of iota. On the off chance that a substance contains more than one sort of iota, it is a compound. A component is comprised of one kind of particle in particular and can't be part further. A compound has the consolidated properties of the components from which it is made.
A component is an unadulterated substance comprising of a solitary sort of particle. In a drop of mercury (Hg) for the most part, there isn't a debasement present. Henceforth, it is alluded to as an unadulterated substance. Further, component alludes to a compound substance involving just one sort of particle.
Answer
a) Electron is moving toward right and brought to rest it means that force should be in opposite direction of motion electron.
We know F = qE here q = -e so, Force will be F = - eE.
Force on electron will be acting in opposite direction so, the electric field direction will be towards Right.
b) we know,
Force on electron = Electric force
m a = eE
using equation of motion
v² = u² + 2 a s
0 = (5.5 x 10⁵)² - 2 x a x 0.05
e = 1.6 x 10⁻¹⁹ C
mass of electron, m = 9.1.09 x 10⁻³¹ Kg
now,
E = 17.22 N/C
hence, strength of electric field is equal to E = 17.22 N/C