What is the de Broglie wavelength of a photon with a momentum 5.0 x 10-35 kg m/s? Estimate h as 6.63 x 10-34 J

Apiece of metal with a length of 1.42 cm was measured using four different instruments. which of the following measurements is the most accurate?

Table sugar completely dissolved in water is an example of a?

Consider hydrogen in an excited state n = 5n=5 that emits photons to reach the ground state. there are various possible transitions other than straight to the ground state that can occur; for example, it can drop to the n = 3n=3 state followed by the n = 3n=3 to the ground state transition. which of the possible transitions will result in the emission of a photon in the visible region?