What is work function?

The minimum quantity of energy which is required to remove an electron to infinity from the surface of a given solid, usually a metal. This energy is a measure of how tightly a particular metal holds its electrons—that is, of how much lower the electron’s energy is when present within the metal than when completely free. The work function is important in applications involving electron emission from metals, as in photoelectric devices and cathode-ray tubes.

What is the de Broglie wavelength of a ball of mass 0 . 060 Kg moving at a speed of 1 . 0 m / s ?

The mass of ball is, m = 0.060 kg The speed of ball is, v = 1 . 0 m / s The Plank’s constant is, h = 6 . 6 × 1 0 - 34 Js . The de Broglie wavelength of the ball is, λ = h p . So, λ = h m v = 6 . 6 × 10 − 34 ( 0 . 060 ) ( 1 ) = 1 . 1 × 10 − 32 m . Therefore, the de Broglie's wavelength of this ball is 1 . 1 × 10 − 32 m . Here, the symbols have their usual meaning.

What is the de Broglie wavelength of a bullet of mass 0 . 040 Kg travelling at the speed of 1 . 0 Km / s ?

The mass of bullet is, m = 0.040 kg The speed of bullet is, v = 1 . 0 Km / s = 1000 m / s The Plank’s constant is, h = 6 . 6 × 1 0 - 34 Js Now, the de Broglie wavelength of the bullet is, λ = h p = h m v = 6 .6 × 10 − 34 0 .040 1000 = 1 .65 × 10 − 35 m Therefore, the de Broglie's wavelength of this bullet is 1 . 65 × 10 − 35 m . Here, the symbols have their usual meaning.