1- A baseball weighs 220 g. Top speed for a professional pitcher is about 100 mp

Question

1- A baseball weighs 220 g. Top speed for a professional pitcher is about 100 mph when he throws a fast ball. Find the de Broglie wavelength (in nm) associated with a baseball that is moving with a velocity of 80 mph.

2- The photoelectric effect for a certain alloy has a threshold frequency of 9.20 x 1014 Hz. For light of this frequency, find the energy of one mole of photons (in kJ).

3- Electrons are ejected from sodium metal by any light that has a wavelength shorter than 544 nm. What is the kinetic energy of an electron (in J) that is ejected from sodium by light with a wavelength of 469 nm?

Explanation / Answer

1)
m = 220 g = 0.220 Kg

v = 80 mph
= 35.8 m/s

lambda = h/(m*v)
=(6.626*10^-34)/(0.220*35.8)
= 8.41*10^-35 m

Answer: 8.41*10^-35 m

I am allowed to answer only 1 question at a time

Related Questions

Navigate

• Browse (All)
• Browse 1
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.