Answer:
1.93 cm
Explanation:
The Image Equation for the first lens will be
1/f1 = 1/do - 1/d1
Where f1 = 17cm and d1 = 28.3cm
1/do = 1/f1 + 1/d1
= 1/17 + 1/ 28.3
do = 10.62cm
This image (which is real, inverted, and enlarged) becomes the object for the second lens as we again apply the Image Equation for the second lens
1/ f2 = 1/d2 + 1/d
Since the lenses are 12.8 cm apart, the image formed 10.62 cm to the left of lens #1 is located 2.18 cm to the right of lens #2 so the object distance, then, is
1/d2 = 1/f + 1/d
= 1/17 + 1/2.18
d2 = 1.93cm
It's false i hope this helps :)
Tsunami and under water volcano
It was formed by ancient volcanic eruptions.
Answer:
1.11 V
Explanation:
Given that the Einstein photoelectric equation states that;
KE = E - Wo
E = energy of incident photon
Wo= work function of the metal
E = hf = 6.64 x 10-34 * 6 x 1014
E = 39.84 * 10^-20 J or 3.98 * 10^-19 J
KE = 3.98 * 10^-19 J - 2.2 x 10-19J
KE = 1.78 * 10^-19J
We convert this value of KE to electron volts
KE = 1.78 * 10^-19J/1.6 x 10-19C
KE = 1.11 eV
Hence; 1.11 V will be just sufficient to stop electrons emitted by the sodium photo-plate reaching the collector plate.