Answer:
When the object is placed between centre of curvature and principal focus of a concave mirror the image formed is beyond C as shown in the figure and it is real, inverted and magnified.
Explanation:
O Protons and neutrons grouped in a specific pattern
O Protons and electrons spread around randomly
Answer:
The magnitude of the electric field at the center of the circle is 85 N/C
The correct option is b. 85 N/C
Explanation:
Please see the attachments below
Answer:
Velocity ratio of a lever is 3 means distance travelled by effort is 3 times the distance travelled by the load. Efficiency of the pulley is 60%means 40% of the energy is lost in the machine due to the friction
<span>You are given a ν0 of cesium and you are asked to find the threshold frequency. First, you have to know the half reaction of cesium which is
Cs(g) </span>→ Cs⁺ + e⁻ with a ΔHIP of 375.7 kJ/mol
Then convert kilojoules to joules and then divide this by the Avogadro's constant which is 6.023 x 10²³ atoms/mole to give the energy of photon in joules per photon
<span>
E = (375,700 J/mol) / (6.023 x 10</span>²³ photons/ mole)
E = 6.239 x 10⁻¹⁹ J/photon
<span>
Use the equation of energy of a photon
E = hv where E is the energy of the photon, h is the planck's constant and v is the threshold frequency
E = hv
</span>6.239 x 10⁻¹⁹ J/photon = 6.626 x 10⁻³⁴ (v)
<span>v = 9.42 x 10</span>¹⁴ s⁻¹ Hz