If the potential difference is increased by 9 times, the de-Broglie wavelength becomes ________ times the original.

(a)

\(\frac{1}{3}\)

(b)

3

(c)

9

(d)

\(\frac{1}{9}\)

Find the energy released when 5.5 g of matter is used.

(a)

1.6 x 10⁸ J

(b)

49.5 x 10¹⁵ J

(c)

49.5 x 10¹⁵ J

(d)

1.6 x 10¹⁹J

The length of a moving scale is 6 m, whose velocity is 2 x 10⁷ m/s. Find its rest length.

(a)

7.6 m

(b)

15 m

(c)

3 m

(d)

6.013 m

The highest magnification order that can be achieved using optical microscope is _________

(a)

60

(b)

2000

(c)

76 x 10⁴

(d)

10⁵

The number of de Broglie waves of an electron in the nth orbit of an atom is ___________.

(a)

n

(b)

n-1

(c)

n+1

(d)

2n