Answer:
J
Explanation:
The complete statement is given as
What is the maximum kinetic energy of electrons ejected from barium (Wo = 2.48 eV) when illuminated by white light, 400 nm to 750 nm ?
= wavelength of the white light = 400 nm = 400 x 10⁻⁹ m
= speed of white light = 3 x 10⁸ ms⁻¹
Energy of the white light is given as
= Work function of barium = 2.48 eV = 2.48 x 1.6 x 10⁻¹⁹ J
= Maximum kinetic energy
Using photoelectric equation we have
Answer:
(a) There are 3.17 times more shakes in a second than seconds in a year.
(b) Humans have existed for 9067.72 universe seconds.
Explanation:
(a) First we calcule how many seconds are in a year. One year have 365 days, one day has 24 hours, one hour has 60 minutes and one minute has 60 seconds, so:
Now, we calculate how many shakes are in a second:
Finally, we calculate how many more shakes in a second are there than seconds in a year:
(b) Using a simple rule of three we can calculate how many "universe seconds" have humans existed, recall that 1 day has 86400 seconds:
1010 years--------->86400s
106 years----------> x seconds
Answer:
The distance covered by puck A before collision is
Explanation:
From the question we are told that
The label on the two hockey pucks is A and B
The distance between the two hockey pucks is D 18.0 m
The speed of puck A is
The speed of puck B is
The distance covered by puck A is mathematically represented as
=>
The distance covered by puck B is mathematically represented as
=>
Since the time take before collision is the same
substituting values
=>
=>
Answer:
horizontal distance left of the loop should you launch is 7.1m
Explanation:
See attached file
