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

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?

Expert Solution

queen_honey_blossom answered 2 years ago

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