The wavelength of light in a medium is = _0 , where is the wavele… - Vidyadip

Question

The wavelength of light in a medium is $\lambda=\frac{\lambda_0}{\mu},$ where $\lambda$ is the wavelength in vacuum. A beam of red light $(\lambda_0=720\text{nm})$ enters into water. The wavelength in water is $\lambda=\frac{\lambda_0}{\mu}=540\text{nm}.$ To a person under water does this light appear green?

✓

Answer

Colour of light will depend only on the frequency of light and not on the wavelength of the light. So, light will appear red to an observer under water.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "2 Marks Questions" from Light Waves→Light Waves — all question types→Physics STD 11 Science question papers→Rajasthan Board STD 11 Science question papers→Rajasthan Board question paper generator→

Similar questions

Two cylinders A and B of equal capacity are connected to each other via a stopcock. A contains a gas at standard temperature and pressure. B is completely evacuated. The entire system is thermally insulated. The stopcock is suddenly opened. Answer the following:
Do the intermediate states of the system (before settling to the final equilibrium state) lie on its P-V-T surface?

The electric current in a discharging R-C circuit is given by $\text{i}=\text{i}_0\text{e}^{-\frac{\text{t}}{\text{RC}}}$ where i₀, R and C are constant parameters and t is time. Let $\text{i}_0=2.00\text{A},\text{R}=600\times10^5\Omega$ and $\text{C}=0.500\mu\text{F}.$

Find the current at t = 0.3s.
Find the rate of change of current at t = 0.3s.
Find approximately the current at t = 0.31s.

Find the dimensions of:

Linear momentum.
Frequency.
Pressure.

A diatomic gas is suddenly compressed to 1/4 of its initial volume. Find the ratio of final and initial pressure $(\gamma = 1.5)$.

Is a slow process always isothermal? ls a quick process always adiabatic?

A sample of 0.177g of an ideal gas occupies 1000cm³ at STP. Calculate the rms speed of the gas molecules.

Two particles move periodically in the same straight line, their amplitude and frequency are the same. At the time when their displacement is half the amplitude, they cross each other going in opposite directions, what is the time difference between them?

Show that the orbital velocity of a satellite revolving the earth is 7.92km s^-1.

A Carnot engine works between temperatures $T_1 K$ and $T_2 K$. Prove that to increase its efficiency it will be more effective to reduce the sink temperature to the same value than increasing the source temperature.

Calculate the number of degrees of freedom in 15cm³ of nitrogen at NTP.