Answer: D
Explanation: because doing a yoga desk program is physical activity, 10k steps is pysical activity, riding a bike or walking/running is also physical activity. so it should be D, all of the above.
950kg. It is W=mg. therefore, mass= W/g which is W/10
=9500/10
=950
Answer:negative charge, small relative mass, and found outside the nucleus
Explanation:
The electron is one of the subatomic particles. It is negatively charged and has a relatively small or somewhat negligible mass. It is found outside the nucleus on the orbits. The electron is bound to the nucleus by electrostatic forces of attraction in the Bohr's model of the atom.
The wavelength of violet light is given as 4.2x10^-7 m and the speed of light is 3x10^8 m/sec
The equation relating between the frequency and the wavelength is as follows:
speed of light = wavelength x frequency
Substitute with the givens in the above equation to get the frequency of violet light as follows:
frequency = (3 x 10^8) / (4.2 x 10^-7) = 7.14285 x 10^14 Hz
The threshold frequency of cesium is <span>9.39x10^14 Hz.
Since the frequency of violet light is less than the threshold frequency of cesium, therefore, the exposure to violet light won't </span><span>cause electrons to be emitted from cesium.</span>
