Atoms Test - 61...

In a muonic atom, a muon of mass of 200 times of that of electron and same charge is bond to the proton. The wavelengths of its Balmer series are in the range of  :

A student measures the level of radiation emitted by a radioactive sample.
The table shows the readings she records on the counter over a short period of time.

Counter reading/ counts per minute

$$106$$

$$96$$

$$98$$

$$100$$

The sample is removed and the counter then shows a background radiation reading of $$4$$ counts per minute.
What is the best estimate for the average count rate due to the radioactive sample?

Which statement about the structure of an atom is correct?

Cathode rays are made to pass between the plates of a charged capacitor, It attracts.

The cathode ray particles originates in a discharge tube from the

The diagram shows a cathode-ray oscilloscope display of an electromagnetic wave. The time base setting is $$ 0.20 \mu s cm^{-1}$$. Which statement is correct? 

For which of the following set of quantum numbers, an electron will have the lowest energy ?

Which is the common node for all orbitals:

Which of the following curves may represent radius of orbit in $$H-$$atom as a function quantum number ?

The number of orbitals in $$3^{rd}$$ orbit are :