Gamma Rays

Q.

What are the different types of electromagnetic waves?

Q.

How do you calculate bandwidth from frequency?

Q.

Which of the following has the lowest wavelength?

1. Infrared rays

2. Gamma rays

3. X rays

4. Ultra violet waves

Q.

Which color light has the highest frequency?

Q.

A carrier signal $C\left(t\right)=25\sin (2.512\times {10}^{10}t)$ is amplitude modulated by a message signal $m\left(t\right)=5\sin (1.57\times {10}^{8}t)$ and transmitted through an antenna. What will be the bandwidth of the modulated signal?

1. $1987.5MHz$

2. $2.01GHz$

3. $50MHz$

4. $8GHz$

Q. Define Polarization.

Q.

The most energetic electromagnetic radiations are

1. Microwaves

2. Gamma rays

3. Ultraviolet waves

4. X rays

Q.

Which of the following radiations has a wavelength longer than that of visible light?

1. X-ray waves

2. Gamma waves

3. Infrared waves

4. Ultraviolet waves

Q.

A. wavelength of microwave is greater than that of ultraviolet rays.
B. The wavelength of infrared rays is lesser than that of ultraviolet rays.
C. wavelength of microwave is lesser than that of ultraviolet rays
D. Gamma rays have the shortest wavelength in the electromagnetic spectrum.
Choose the correct option from the given options.

1. A and B are correct

2. B and C are correct

3. C and D are correct

4. A and D are correct

Q.

What are two uses of gamma rays?

Q.

The most energetic electromagnetic radiations are :

(a) microwaves (b) ultraviolet waves

(c) X-rays (d) gamma rays.

Q.

Which of the following statements is NOT true about electromagnetic waves?

1. When EM waves are absorbed, they may create tiny alternating currents with the same frequency as the radiation.

2. Electromagnetic waves with high frequencies are the most dangerous to be exposed to.

3. All electromagnetic radiation can travel through a vacuum including Space.

4. When EM waves are absorbed, they may cause cooling.

Q.

A particular type of high energy invisible electromagnetic rays help us to study the structure of crystals. The radiation is

1. UV

2. Gamma

3. X-Rays

4. IR

Q.

Two properties common to gamma radiations and visible light are:

1. Both are high energy radiations and travel with the same speed in air or vacuum

2. Both are Low energy radiations and travel with the same speed in air or vacuum

3. Both are electromagnetic waves and produce sensation on our retina

4. Both are electromagnetic waves and travel with the same speed in air or vacuum

Q.

Name the waves (a) of lowest wavelength, (b) used for taking photographs in dark, (c) produced by the changes in the nucleus of an atom, (d) of wavelength nearly 0.1 nm.

Q.

The radiation exposure is measured by the unit called __.

Q.

Sky wave communication is based upon

1. reflection by ionosphere

2. absorption by ionosphere

3. transmission through ionosphere

4. none of these

Q.

A radium source which emits α, β and gamma radiations is placed in a lead block. The beam of radiations emitted is split into thre parts by a strong magnetic field. Which type of radiations is responsible for each of the marks X, Y and Z in this figure and differentiate with respect to charge, and nature.

1. X =Gamma Radiations , Y = Alpha Particles, Z = Beta Particles

2. X = Alpha Particles , Y = Gamma Radiations , Z = Beta Particles

3. X = Alpha Particles , Y = Beta Particles , Z = Gamma Radiations

4. X = Beta Particles, Y = Gamma Radiations , Z = Alpha Particles

Q.

Which region in the electromagnetic spectrum will have the highest speed?

Q. A. wavelength of microwave is greater than that of ultraviolet rays.
B. The wave length of infrared rays is lesser than that of ultraviolet rays.
C. wavelength of microwave is lesser than that of ultraviolet rays
D. Gamma rays has shortest wavelength in the electromagnetic spectrum.
Choose the correct option from the given options.

1. A and B are true
2. C and D are true
3. B and C are true
4. A and D are true

Q.

A wave has a wavelength ${10}^{-3}nm$. (a) Name the wave. (b) State its one property different from light.

Q.

All components of the electromagnetic spectrum in vacuum have the same

1. Energy

2. Velocity

3. Wavelength

4. Frequency

Q.

What is the relationship between frequency and diffraction?

Q.

Name the region beyond the violet end of the spectrum.

Q.

A wave pulse on a string moves a distance of 16 m in 0.4 s. Find the speed of the pulse.

Q. Infrared waves are used in microwaves to heat food by heating water present in the food

1. False
2. True

Q. Wavelength of gamma rays are :

1. ${10}^{-10}m$ to less than ${10}^{-14}m$
2. ${10}^{-14}m$ to less than ${10}^{-10}m$
3. ${10}^{-11}m$ to less than ${10}^{-14}m$
4. ${10}^{-14}m$ to less than ${10}^{-6}m$

Q.

What is the effect of increasing modulation index in FM?

Q.

How are electromagnetic spectrum and electromagnetic waves related?

Q. UV Rays are useful for

1. Sterilizing purposes
2. Detecting purity of gems, ghee, etc
3. Producing Vitamin D in food of plants and animals
4. All of the above