Aquartz crystal vibrates with a frequency of 64,621 hz. what is the period of the crystal's motion in milliseconds?

What is the energy of a photon of ultraviolet radiation with a frequency of 4.4 × 1015 hz? planck’s constant is 6.63 × 10–34

On a day when the barometer reads 75.23 cm, a reaction vessel holds 250 ml of ideal gas at 20 celsius. an oil manometer ( ρ= 810 kg/m^3) reads the pressure in the vessel to be 41 cm of oil and below atmospheric pressure. what volume will the gas occupy under s.t.p.?

If the textbook weighs 19.6 newtons on venus,what is the strength of gravity on venus?