a) =hf=hc/v
5.66 x10-19 J = (6.626 x10-34 Js2)(3.0 x108 m/s2)/v
v= 3.51 x10-7 m or 351 nm
b) =hf
=(6.626 x10-34Js2)(1.24 x1015 Hz)
= 8.28 x10-19 J
c) first, calculate the work function that 289 nm gives:
=hf=hc/v
= (6.626 x10-34 Js2)(3.0 x108 m/s2)/ (289 x10-9 m)
= 6.88 x10-19
comparing this with the values of given for each metal, you can conclude that electrons will be
ejected from cadmium, manganese, and calcium because their respective work functions are
lower that 6.88 x10-19
Solution
a) =hf=hc/v
5.66 x10-19 J = (6.626 x10-34 Js2)(3.0 x108 m/s2)/v
v= 3.51 x10-7 m or 351 nm
b) =hf
=(6.626 x10-34Js2)(1.24 x1015 Hz)
= 8.28 x10-19 J
c) first, calculate the work function that 289 nm gives:
=hf=hc/v
= (6.626 x10-34 Js2)(3.0 x108 m/s2)/ (289 x10-9 m)
= 6.88 x10-19
comparing this with the values of given for each metal, you can conclude that electrons will be
ejected from cadmium, manganese, and calcium because their respective work functions are
lower that 6.88 x10-19.
80 ĐỀ THI THỬ TUYỂN SINH TIẾNG ANH VÀO 10 SỞ GD – ĐT THÀNH PHỐ HỒ CHÍ MINH NĂ...
ExplanationAldosterone stimulates kidneys to reabsorb sodium and .pdf
1. Explanation:
Aldosterone stimulates kidneys to reabsorb sodium and the water follows the sodium
osmotically. This results in decreased urine volume.
Solution
Explanation:
Aldosterone stimulates kidneys to reabsorb sodium and the water follows the sodium
osmotically. This results in decreased urine volume.
