PLEASE HELP! Modern Physics!

1) A mosquito moving at 7 m/s has a de Broglie wavelength of 9.4 × 10−30 m.
What is the mass of this mosquito? Planck’s constant is 6.63 × 10−34 J · s.
Answer in units of kg.

2) A photon in a laboratory experiment has an energy of 8.5 eV.
What is the frequency of this photon? Planck’s constant is 6.63 × 10−34 J · s.
Answer in units of Hz.

3) What is the de Broglie wavelength of a 1451 kg car traveling at 31 km/h?
Planck’s constant is 6.63 × 10−34 J · s. Answer in units of m.


I AM IN DESPERATE NEED OF HELP! This online assignment is due in the morning and I completely have no idea how to do these three problems. PLEASE HELP!!!!!!!!

1) lambda = h/(m*v)
m = h / (lambda*v) = (6.63*10^-34 J*s) / (9.4*10^-30 m * 7 m/s) = 1.0076*10^-5 kg

2) E = h*f
f = E / h
E = 8.5 eV * (1.6*10^-19 J / 1 eV) = 1.36*10^-18 J
f = (1.36*10^-18 J) / (6.63*10^-34 J*s) = 2.051*10^15 Hz

3) v = 31 km/hr *(1000m/ 1km) * (1hr / 3600 s) = 8.61 m/s
lambda = h / (m*v) = (6.63*10^-34 J*s) / (1451 kg * 8.61 m/s) = 5.31*10^-38 m

We used to teach the engineers, if you don't know the physics, get the units to figure out....most of the time they didn't kill themselves.

When someone eats beans, the pressure builds inside the chamber. That pressure is then released into an area of lower pressure.